五年级解方程练习题180题及答案.doc

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五年级解方程


(1) (0.5+x)+x=9.8

÷2






2) 2(X+X+0.5)=9.8





3) 25000+x=6x





4) 3200=440+5X+X






5) X-0.8X=6





(6)12x-8x=4.8




(7) 7.5+2X=15





(8)1.2x=81.6






7) x+5.6=9.4





(10)x-0.7x=3.6




(11)91

÷x=1.3



(12) X+8.3=10.7

(13) 15x

=3
(14) 3x -8=16
(15) 3x+9=27
(16) 18(x-2)=270
(17) 12x=300-4x
(18) 7x+5.3=7.4
(19) 3x

÷5=4.8
(25)

0.5x+8=43
(26) 6x-3x=18
(27)

7(6.5+x)=87.5
(28) 0.273

÷x=0.35




(29) 1.8x=0.972


(42 ) 5.6x=33.6


(30) x



÷ 0.756=90
(43) 9.8-x=3.8


(31) 0.1(x+6)=3.3



× 0.4
(44) 75.6 ÷ x=12.6


(32) (27.5-3.5)

÷ x=4




(33)

9x-40=5




(34) x

÷ 5+9=21





(35)


48-27+5x=31



(36)

10.5+x+21=56



(37) x+2x+18=78




(38) (200-x)

÷5=30




(39) (x-140)

÷ 70=4



(40) 20-9x=2








(41) x+19.8=25.8


(45)
(46)
(47)
(48)
(49)
(50)
(51)
(52)
(5 3)
×7+4x=12.5
x ÷ 1.5-1.25=0.75
4x-1.3

× 6=2.6
5x+12.5=32.3
5(x+8)=102
x+3x+10=70
3(x+3)=50-x+3
5x+15=60
3.5-5x=2
0.3









(54) 6x+12.8=15.8 (66)13(x+5)=169
(55) 150 × 2+3x=690 (67) 2x-97=34.2
(56)
(57)
(58)< br>(59)
(60)
(61)
(62)

(63)

(64)



(65)

2x-20=4
3x+6=18
2(2.8+x)=10.4
(x-3) ÷2=7.5
13.2x+9x=33.3
3x=x+100
x+4.8=7.2
6x+18=48
3(x+2.1)=10.5
12x-9x=8.7
(68)3.4x-48=26.8
(69)42x+25x=134
(70)1.5(x+1.6)=3.6
(71)2(x-3)=5.8
(72)65x+7=137
(73) 9x+4 ×2.5 =91
(74)
4.2 x+2.5x =134
(75) 10.5x+6.5x=51

(76) 89x-43x=9.2

(77) 5x-45=100



(78) 1.2x-0.5x=6.3




(79) 23.4=2x




(80) 4x-x=48.6




(81) 4.5x-x=28




(82)X-5.7=2.15





(83)5X-2X=18




(84)3X+0.7=7





( 85) 3.5 ×2= 4.2+x





(86) 26 ×1.5= 2x+10


(87) 0.5 × 16―16×0.2=4x







(88) 13 9.25

-X=0.403








(89) 18.9

÷X=0. 3








(90) 23x=14x +27



(91) x +14x=75
(92 )95-5x= 80
(93)1.8 +6x =54
(94) 6.7x

-60.3 =6.7
(95) 9 +4x=53
(96) 2x+8=16
(97) 20x-14x=24
(98) x+7x=8
(99) 9x-3x=6
(100 ) 6x-8=4
(101) 5x+x=9
(102) 8x-8=6x






(103)
4
x=20

5

(104) 2x-6=12
(105 ) 7x+7=14
(106) 6x-6=0
(107) 5x+6=11
(108) 2x-8=10
(109) 2.5x-8=4

(110) x-
3
=7


4


(111)3x+7=28


(112) 3x-7=26


(113) 9x-x=16





(114) 24x+x=50


(115) 1.2x-8=4

(116) 3x-8=31
(117) 6x+6=12
(118) 3x-3=3
(119) 5x-3x=4
(120) 2x+16=19
(121) 5x+8=19
(122) 14-6x=8


(123) 15+6x=27

(124) 5-8x=4

(125) 7x+8=15

(126) 9-2x=1



(127) 4+5x=9




(128) 10-x=8





(129) 8x+9=17




(130) 9+6x=15




(131) x+9x=4+7





(132) 2x+9=17

(133) 8-4x=6
(134) 6x-7=28
(135) 7x-9=20
(136) x-56=1
(137) 8-7x=1
(138)x-30=12
(139) 6x-21=21


(140) 6x-3=6
(141) 9x=18
(142) 4x-18=14
(143) 5x+9=11
(144) 17-2x=11

(145) x+4+8=23

(146) 7x-12=9
(147) X-5.7=2.15
(148) 5X-2X=18
(149) 3X +0.5=5
(150) 3.5 ×2= 4 x
(151) 26 ×1.5= 2x








(152) 0.5

×16―16× 0.1=4x








(153) 9.26

- X=0.402








(154) 36.9

÷X=0.3








(155) X ÷0.5=2.6




(156) 93 - 5x=80





(157) 180-6x

=54




(158) 9 +4x= 40




(159) 0.2x

-0.4 +0.5 = 3.7





(160) 9.4x

-0.4x = 16.2




(161) 92 - 4x=20





(162) 7x ÷ 6=1.4





(163) 16x +34x=1


(164) 18x -14x=12
(165) 3 x

-42÷14=15
(166) 12 + 4x=56
(167) 22 - 14x=12
(168) X+8.3=10.7
(169) 5x

=30
(170) x-5.6=9.4
(171) x ÷0.8=90
(172) 3x - 8= 16
(173) 3x+9=27
(174) 5.3+7x=7.4




(175) 3x ÷ 5=4.8


(181) x ÷5+9=21


(176) X-0.8X=6


(177) 12x+8x=4.8








(182)(300-x)

÷5=30
(178) 7(x-2)=49








(183) 91 ÷ x =1.3
(179) 4 ×8+2x=36





(184) 41-3x=17
÷ 3=7
(180) (x-2)




































五年级解方程
180题答案


X=2.2
÷ 2 ( 3) 25000+x=6x
25000+x-x=6x-x
5x=25000
5x ÷5=25000÷ 5
X=5000
( 4) 3200=440+5X+X
6x+440=3200
6x+450-450=3200-440
6x=2760
6x ÷ 6=2760÷ 6
X=460
( 1) (0.5+x)+x=9.8
0.5+2x=4.9
2x=4.4
2x
X=2.2
2x+2x+1=9.8
4x=8.8
4x

0.5+2x-0.5=4.9-0.5


÷ 2=4.4 ÷ 2

( 2) 2(X+X+0.5)=9.8


4x+1-1=9.8-1


÷4=8.8 ÷ 4





5) X-0.8X=6

0.2x=6
0.2=6 ÷ 0.2

0.2x

÷

X=30

(6)12x-8x=4.8

4x=4.8

4x ÷ 4=4.8 ÷ 4

X=1.2
(7) 7.5+2X=15
2x+7.5-7.5=15-7.5
2x=7.5

2x ÷ 2=7.5 ÷ 2

X=3.75
(8)

1.2x=81.6

1.2x ÷ 1.2=81.6 ÷ 1.2

X=68
(9) x+5.6=9.4
X+5.6-5.6=9.4-5.6


X=3.8

(10)x-0.7x=3.6


0.3x=3.6

0.3x ÷ 0.3=3.6 ÷ 0.3

X=12

(11)91 ÷ x= 1.3
91 ÷ x× x=1.3 ×

x 1.3x=91

1.3x ÷ 1.3=91 ÷ 1.3

X=70
(12) X+8.3=10.7

X+8.3-8.3=10.7-8.3

X=2.4

(13) 15x
= 3


15x

÷ 15=3÷ 15

X=0.2


(14)

3x - 8=16
3x-8+8=16+8

3x=24
3x ÷ 3=24÷ 3

X=8
(15)

3x+9=27

3x+9-9=27-9

3x=18
3x ÷ 3=18÷ 3





3x=6
(16) 18(x-2)=270
18x-36=270


18x-36+36=270+36

18x=306

18x

÷ 18=306 ÷ 18

X=17
(17) 12x=300-4x

12x+4x=300-4x+4x

16x=300

16x ÷16=300 ÷ 16

X=18.75
(18) 7x+5.3=7.4
7x+5.3-5.3=7.4-
5.3 7x=2.1
7x ÷ 7=2.1 ÷7

X=0.3
(19)

3x ÷ 5=4.8

3x ÷5× 5=4.8 × 5

3x=24

3x

÷ 3=24÷ 3

X=8
(20)

30 ÷ x+25=85

30 ÷x+25-25=85-25

30

÷ x=60
30 ÷ x× x=60×

x 30=60x

60x

÷ 60=30÷ 60

X=0.5

(21) 1.4
× 8-2x=6


11.2-2x+2x=6+2x

11.2=6+2x

2x+6-6=11.2-6

2x=5.2

2x

÷ 2=5.2 ÷ 2

X=2.6

(22) 6x-12.8
×3=0.06

6x-38.4=0.06


6x=38.46


6x
÷6=38.46 ÷6


X=6.41


(23) 410-3x=170

410-3x+3x=170+3x

170+3x=410
3x+170-170=410-170




3x=240


3x
÷ 3=240÷3

X=80

(24)

3(x+0.5)=21

3x+1.5=21

3x+1.5-1.5=21-1.5


3x=19.5


3x
÷ 3=19.5 ÷ 3

X=6.5

(25)

0.5x+8=43

0.5x+8-8=43-8


0.5x=35

0.5x
÷ 0.5=35 ÷ 0.5

X=70

(26) 6x-3x=18


3x=18


3x
÷ 3=18÷ 3

X=6

(27) 7(6.5+x)=87.5


7x+45.5=87.5

7x+45.5-45.5=87.5-45.5

7x=42


7x
÷ 7=42÷ 7


X=6


(28) 0.273
÷ x=0.35

x=0.273
÷ 0.35


X=0.78


(29)

1.8x=0.972

1.8x
÷1.8=0.972 ÷ 1.8


X=0.54


(30)

x
÷ 0.756=90
x÷ 0.756 ×0.756=90 × 0.756


X=68.04

(31)

0.1(x+6)=3.3
× 0.4


0.1x+0.6=1.32

0.1x+0.6-0.6=1.32-0.6


0.1x=0.72


0.1x
÷ 0.1=0.72 ÷ 0.1

X=7.2

(32) (27.5-3.5)
÷ x=4

24

÷ x=4

x=24
÷ 4




X=6

(33) 9x-40=5

9x-40+40=5+40
9x=45

9x
÷ 9=45÷ 9
X=5

(34) x
÷ 5+9=21
x
÷ 5+9-9=21-9
x
÷ 5=12
x
÷ 5× 5=12× 5
X=60

(35) 48-27+5x=31
5x+21-21=31-21
5x=10

5x
÷ 5=10÷5
X=2

(36) 10.5+x+21=56
x+31.5-31.5=56-31.5
x=24.5

(37) x+2x+18=78
3x+18-18=78-18
3x=60

3x
÷ 3=60÷3
X=20

(38) (200-x)
÷ 5=30
(200-x)
÷ 5× 5=30× 5
200-x=150
200-x+x=150+x
150+x=200
X+150-150=200-150

X=50


(39) (x-140)
÷ 70=4
(x-140)
÷ 70× 70=4× 70
X-140=280
X-140+140=280+140

X=420

( 40) 20-9x=2

9x=20-2

9x=18

9x
÷ 9=18÷ 9
X=2

(41) x+19.8=25.8
X+19.8-19.8=25.8-19.8
X=6




(42 )
5.6x=33.6

5.6x
÷5.6=33.6 ÷ 5.6
X=6


( 43) 9.8-x=3.8

9.8-x+x=3.8+x

3.8+x=9.8

X=9.8-3.8

X=6

( 44) 75.6 ÷ x=12.6
X=75.6
÷ 12.6
X=6


( 45) 5x+12.5=32.3

5x+12.5-12.5=32.3-12.5
5x=19.8

5x
÷ 5=19.8 ÷5

X=3.96

( 46) 5(x+8)=102

5x+40=102

5x+40-40=102-40

5x=62

5x
÷ 5=62÷ 5

X=12.4

( 47) x+3x+10=70

4x+10=70

4x+10-10=70-10

4x=60

4x
÷ 4=60÷ 4

X=15

( 48) 3(x+3)=50-x+3
3x+9=53-x

3x+x+9-9=53-x+x-9
4x=44

4x
÷ 4=44÷ 4
X=11





( 49) 5x+15=60
5x+15-15=60-15
5x=45
5x
÷ 5=45÷ 5

X=9
( 50) 3.5-5x=2
3.5-5x+5x=2+5x


5x+2=3.5
5x+2-2=3.5-2
5x=1.5
5x
÷ 5=1.5 ÷5
X=0.3
( 51) 0.3 × 7+4x=12.5
4x+2.1=12.5
4x+2.1-2.1=12.5-2.1
4x=10.4
4x
÷ 4=10.4 ÷ 4
X=2.6
( 52) x ÷ 1.5-1.25=0.75
x ÷ 1.5-1.25+1.25=0.75+1.25
x
÷ 1.5=2
x
÷ 1.5 × 1.5=2 × 1.5
X=3
( 53) 4x-1.3 × 6=2.6
4x-1.3 × 6+1.3 × 6=2.6+1.3 × 6
4x=10.4
4x
÷ 4=10.4 ÷ 4
X=2.6
( 54)
6x+12.8=15.8
6x+12.8-12.8=15.8-12.8
6x=3
6x
÷ 6=3÷ 6
X=0.5

( 55) 150 × 2+3x=690
3x+300=690
3x+300-300=690-300
3x=390
3x
÷ 3=390÷ 3
X=130
( 56) 2x-20=4
2x-20+20=4+20
2x=24
2x
÷ 2=24÷2
X=12
( 57) 3x+6=18
3x+6-6=18-6
3x=12
3x
÷ 3=12÷ 3
X=4
( 58) 2(2.8+x)=10.4





5.6+2x=10.4
2x+5.6-5.6=10.4-5.6
2x=4.8
2x
÷ 2=4.8 ÷2


X=2.4
( 59) (x-3) ÷ 2=7.5
( x-3 )÷ 2× 2=7.5 ×2
X-3=15

X=18

( 60) 13.2x+9x=33.3
22.2x=33.3
22.2x
÷ 22.2=33.3 ÷ 22.2

X=1.5
( 61) 3x=x+100
3x-x=x-x+100
2x=100
2x ÷ 2=100÷ 2
X=50

( 62) x+4.8=7.2
X=7.2-4.8
X=2.4
( 63) 6x+18=48
6x+18-18=48-18
6x=30
6x
÷ 6=30÷ 6
x=5
( 64) 3(x+2.1)=10.5
3x+6.3=10.5
3x=10.5-6.3
3x=4.2
3x
÷ 3=4.2 ÷ 3
X=1.4
( 65) 12x-9x=8.7
3x=8.7
3x
÷3=8.7 ÷ 3

X=2.9

( 66) 13(x+5)=169
13x+65=169
13x+65-65=169-65
13x=104

13x
÷13=104 ÷ 13
X=8
( 67) 2x-97=34.2
2x-97+97=34.2+97


2x=131.2

2x
÷ 2=131.2 ÷2
X=65.6


( 68) 3.4x-48=26.8
3.4x-48+48=26.8+48
3.4x=74.8

3.4x
÷ 3.4=74.8 ÷ 3.4
X=22

( 69) 42x+25x=134
67x=134

67x
÷ 67=134 ÷ 67
X=2

( 70) 1.5(x+1.6)=3.6
1.5x+2.4=3.6

1.5x=3.6-2.4
1.5x=1.2

1.5x
÷ 1.5=1.2 ÷ 1.5
X=0.8

( 71) 2(x-3)=5.8

2x-6=5.8

2x-6+6=5.8+6

2x=11.8

2x
÷ 2=11.8 ÷ 2
X=5.9

( 72) 65x+7=137

65x+7-7=137-7

65x=130

65x ÷ 65=130 ÷ 65
X=2

( 73) 9x+4 × 2.5 = 91
9x+10=91

9x+10-10=91-10
9x=81

9x
÷ 9=81÷9
X=9


(74) 4.2 x+2.5x
= 134
6.7x=134

6.7x
÷ 6.7=134 ÷ 6.7
X=20

(75) 10.5x+6.5x=51
17x=51

17x
÷ 17=51÷17
X=3



(76) 89x-43x=9.2
46x=9.2

46x
÷46=9.2 ÷ 46
X=0.2


(77) 5x-45=100

5x-45+45=100+45
5x=145

5x ÷ 5=145÷ 5

X=29
(78) 1.2x-0.5x=6.3

0.7x=6.3

0.7x
÷0.7=6.3 ÷ 0.7

X=9
(79) 23.4=2x
2x
÷ 2=23.4 ÷ 2
X=11.7
(80) 4x-x=48.6
3x=48.6
3x
÷ 3=48.6 ÷ 3
X=16.2

(81) 4.5x-x=28
3.5x=28
3.5x
÷ 3.5=28 ÷ 3.5
X=8
(82 ) X-5.7=2.15


X=5.7+2.15

X=7.85
( 83) 5X-2X=18

3x=18

3x
÷3=18÷ 3
X=6

( 84) 3X+0.7=7
3x+0.7-0.7=7-0.7

3x=6.3

3x
÷3=6.3 ÷ 3
X=2.1

( 85) 3.5 × 2= 4.2+x
4.2+x=7
X=7-4.2
X=2.8
(86) 26
× 1.5= 2x+10
2x+10=39
2x+10-10=39-10
2x=29


2x

÷ 2=29÷ 2
X=14.5

(87) 0.5
×16― 16× 0.2=4x

4x=4.8

4x
÷4=4.8 ÷ 4

X=1.2
(88) 13 9.25
- X=0.403

X=139.25-0.403

X=138.847
(89) 18.9
÷ X=0. 3
X=18.9
÷ 0.3
X=63

(90) 23x=14x
+ 27
23x-14x=14x-14x+27
9x=27

9x
÷9=27÷ 9
X=3

(91) x

+ 14x=75
15x=75

15x
÷ 15=75÷ 15
X=5

(92 ) 95- 5x= 80
95-5x+5x=80+5x
5x+80=95

5x+80-80=95-80
5x=15

X=3

( 93) 1.8 +6x = 54
6x=54-1.8
6x=52.2
6x
÷ 6=52.2 ÷6

X=8.7

( 94) 6.7x - 60.3 = 6.7

6.7x=60.3+6.7

6.7x=67
6.7x

÷ 6.7=67 ÷ 6.7

X=10
(95) 9

+ 4x= 53
4x=53-9

4x=44

4x ÷ 4=44÷ 4
X=11

(96) 2x+8=16

2x=16-8

2x=8




2x ÷ 2=8÷ 2

X=4
(97) 20x-14x=24
6x=24


6x

÷6=24÷ 6

X=4
(98)

x+7x=8

8x=8

X=1
(99) 9x-3x=6
6x=6
X=1


(100 ) 6x-8=4

6x-8+8=4+8

6x=12

X=2
( 101) 5x+x=9

6x=9

6x

÷ 6=9÷ 6

x=1.5


102) 8x-8=6x

8x-8+8=6x+8
8x-6x=6x-6x+8

2x=8
2x÷ 2=8÷ 2

X=4
( 103)

4
x=20
4
5

4
=20÷
4

5

5
5


X=25
(104)

2x-6=12
2x-6+6=12+6
2x=18
2x÷ 2=18÷ 2

X=9

(105 )

7x+7=14

7x+7-7=14-7

7x=7

7x

÷ 7=7÷ 7

X=1


106) 6x-6=0
6x-6+6=0+6
6x=6


X=1
( 107)

5x+6=11





5x+6-6=11-6

5x=5

X=1


108) 2x-8=10

2x-8+8=10+8

2x=18

X=9


109) 2.5x-8=4

2.5x-8+8=4+8

2.5x=12
2.5x
÷ 2.5=12 ÷2.5

X=4.8

( 110)
x-
3

=7


3
4
+
3

X-
=7+
3


4 4 4

X=7.75


111) 3x+7=28
3x+7-7=28-
7 3x=21


3x

÷ 3=21÷ 3

X=7
(112)

3x-7=26
3x-7+7=26+7
3x=33
3x÷ 3=33÷ 3

X=11
(113)

9x-x=16

8x=16

8x ÷ 8=16÷ 8

X=2
(114)

24x+x=50
25x=50

25x ÷ 25=50÷
25 X=2

(115)

1.2x-8=4

1.2x-8+8=4+8

1.2x=12

1.2x

÷ 1.2=12 ÷ 1.2

X=10
(116)

3x-8=31
3x-8+8=31+8

3x=39

3x ÷ 3=39÷ 3

X=13
(117) 6x+6=12



6x+6-6=12-6
6x=6
X=1

(118) 3x-3=3
3x-3+3=3+3
3x=6
3x ÷ 3=6÷ 3
X=2
(119) 5x-3x=4
2x=4
2x ÷2=4÷ 2

X=2
(120) 2x+16=19
2x+16-16=19-16
2x=3
2x ÷2=3÷ 2

X=1.5
(121) 5x+8=19
5x+8-8=19-8
5x=11
5x ÷ 5=11÷ 5
X=2.2
(122) 14-6x=8
14-6x+6x=8+6x
6x+8-8=14-8
6x=6

X=1
(123) 15+6x=27
6x+15-15=27-15
6x=12
6x ÷6=12÷ 6

X=2
(124) 5-8x=4

5-8x+8x=4+8x
8x+4-4=5-4
8x=1
8x ÷ 8=1÷ 8
X=0.125
(125) 7x+8=15

7x+8-8=15-8
7x=7
X=1
(126) 9-2x=1
9-2x+2x=1+2x
2x+1-1=9-1


2x=8
2x ÷ 2=8÷ 2
X=4
(127) 4+5x=9
5x+4-4=9-4
5x=5
X=1
(128) 10-x=8
X=10-8
X=2
(129) 8x+9=17
8x+9-9=17-9
8x=8
X=1
(130) 9+6x=15
6x+9-9=15-9
6x=6
X=1
(131) x+9x=4+7
10x=11
10x ÷ 10=11÷ 10
X=1.1
(132) 2x+9=17
2x+9-9=17-9
2x=8
2x ÷ 2=8÷ 2
X=4
(133) 8-4x=6
8-4x+4x=6+4x
4x+6-6=8-6
4x=2
4x ÷ 2=2÷ 4
X=0.5
(134) 6x-7=28
6x-7+7=28+7
6x=36
6x ÷ 6=36÷ 6
X=6

(135) 7x-9=20
7x-9+9=8+20
7x=28
7x ÷ 7=28÷ 7
X=4
(136) x-56=1



X=56+1
X=57

(137) 8-7x=1
8-7x+7x=1+7x

7x+1-1=8-1
7x=7

X=1


(138) x-30=12

X-30+30=12+30
X=42

(139) 6x-21=21
6x-21+21=21+21
6x=42

6x
÷6=42÷ 6

X=7

(140) 6x-3=6
6x-3+3=6+3

6x=9

6x ÷ 6=9÷ 6

X=1.5
(141) 9x=18

9x
÷ 9=18÷ 9
X=2

(142) 4x-18=14
4x-18+18=14+18

4x=32

4x
÷4=32÷ 4


X=8

(143) 5x+9=11

5x+9-9=11-9

5x=2

5x ÷ 5=2÷ 5

X=0.4

(144) 17-2x=11
17-2x+2x=11+2x

2x+11-11=17-11


2x=6

2x
÷2=6÷ 2

X=3

(145) x+4+8=23

X+12=23

X=23-12


X=11
(146) 7x-12=9


7x-12+12=9+12

7x=21

7x

÷ 7=21÷ 7
X=3

(147) X-5.7=2.15

x=5.7+2.15

X=7.85

(148) 5X-2X=18

3x=18

3x

÷ 3=18÷ 3
X=6

(149) 3X +0.5=5

3x+0.5-0.5=5-0.5

3x=4.5

3x

÷ 3=4.5 ÷ 3
X=1.5

(150) 3.5

× 2= 4 x

4x=7

4x

÷ 4=7÷ 4
X=1.75

(151) 26
×1.5= 2x

2x=39

2x

÷ 2=39÷ 2
X=18

(152) 0.5
× 16― 16× 0.1=4x

4x=6.4


4x
÷4=6.4 ÷ 4

X=1.6

(153) 9.26
- X=0.402
X=9.26-0.402
X=8.858

(154) 36.9
÷ X=0.3
X=36.9
÷0.3
X=123

(155) X
÷0.5=2.6

X=0.5
× 2.6
X=1.3

(156)
93 -5x= 80

93-5X+5X=80+5X
5X+80-80=93-80

5X=13

5X

÷ 5=13÷ 5
X=2.6

(157)
180-6x = 54

180-6X+6X=54+6X




6X+54-54=180-54

6X=126

6X

÷ 6=126÷ 6

X=21

(158) 9

+ 4x= 40

4X+9-9=40-9

4X=31

4X

÷4=31÷ 4

X=7.75
(159)

0.2x -0.4 + 0.5 = 3.7
0.2X-0.5+0.5-0.4+0.4=3.7-0.5+0.4


0.2X=3.6
0.2X÷ 0.2=3.6 ÷ 0.2

X=18
(160) 9.4x -0.4x = 16.2

9X=16.2


9X÷ 9=16.2 ÷9

X=1.8
(161)

92 - 4x= 20

92-4X+4X=20+4X
4X+20-20=92-

20 4X=72

4X
÷ 4=72÷ 4
(162)

X=18
(163)

7x ÷ 6=1.4

7x

÷6× 6=1.4 × 6

7X=8.4

7X

÷ 7=8.4 ÷ 7

X=1.2

(163) 16x

+ 34x=1

50X=1

50X

÷ 50=1÷ 50

X=0.02

(164) 18x

- 14x=12

4X=12

4X

÷ 4=12÷ 4

X=3

(165) 3 x

- 42÷ 14=15

3X-3=15

3X-3+3=15+3

3X=18

3X

÷ 3=18÷3

X=6


(166) 12

+ 4x=56




4X+12-12=56-12

4X=44

4X

÷ 4=44÷ 4

X=11


(167)

22 -14x=12

22-14X+14X=12+14X

14X+12-12=54-12

14X=42
14X

÷ 14=42÷ 14


X=3
(168) X+8.3=10.7

X=10.7-8.3

X=2.4

(169) 5x

= 30

5X÷5=30÷ 5

X=6

(170) x-5.6=9.4

X=5.6+9.4

X=15

(171) x

÷0.8=90

X=0.8

× 90

X=72



(172) 3x

-8= 16

3X-8+8=16+8

3X=24

3X ÷ 3=24÷ 3

X=8
(173) 3x+9=27

3X+9-9=27-9

3X=18

3X ÷ 3=18÷ 3

X=6
(174) 5.3+7x=7.4
7X+5.3-5.3=7.4-5.3


7X=2.1

7X ÷ 7=2.1 ÷ 7

X=0.3
(175)

3x ÷5=4.8

3X=4.8
× 5

3X=24

3X

÷ 3=24÷ 3

X=8
(176) X-0.8X=6
0.2X=6
0.2X

÷ 0.2=6 ÷ 0.2





X=30

(177) 12x+8x=4.8


20X=4.8

20X ÷ 20=4.8 ÷ 20

X=24

(178) 7(x-2)=49

7X-14=49

7X-14+14=49+14


7X=63

7X ÷7=63÷ 7
X=9

(179) 4
× 8+2x=36
2X+32=36

2X+32-32=36-32

2X=4

2X
÷ 2=4÷ 2

X=2

(180) (x-2)
÷3=7

X-2=3
× 7

X-2=21


X=23


(181) x
÷5+9=21
X
÷ 5=21-9
X
÷ 5=12
X=12
× 5
X=60

(182) (300-x)
÷ 5=30

300-X=30
×5
300-X=150

X=300-150

X=150

(183) 91
÷x = 1.3

X=91
÷ 1.3
X=70


(184) 41-3x=17

41-3X+3X=17+3X

3X+17-17=41-17

3X=24

3X
÷ 3=24÷ 3

X=8

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