六年级解方程专项练习题有答案

余年寄山水
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2020年12月19日 21:14
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2020年12月19日发(作者:桑琳)




(1)x﹣=,




(2) x××=,





(3) ﹣4x=,





(4) 8×﹣2x=





(5) :x=3:5,






(6)1﹣20%x=,





(8) 1÷(x﹣)=6,





(9)2x﹣x=,


六年级解方程专项练习200题(有答案)



(10)9×3﹣=,






(11)x﹣25%x=24,





(12)x﹣+=,





(13)+90%x=78,






(14)20%x﹣×3=,





(15)x﹣x=42,




(16)+3×=,





(17)1÷(x﹣)=5,







(18)x﹣=,





(19):x=3:12,





(20)x+=,





(21) :x=1:,






(22) x×(2﹣)=24,






(23) 4x﹣=3,





(24)12x+7×=,





(25)x+x=,





(26)x:42=,





(27)×+x=,





(28):=:x,




(29)χ﹣χ=,






(30)42:=χ:





(31)5x﹣=75%,





( 32) 6x﹣=,





(33)2(x﹣3)=,







(34) =,




(35) 4x﹣3×9=29,




(36)16+8x=40,





(37) x÷=3,




(38)+2x=,


(39)×3﹣7x=,




(40)x﹣1﹣x=2,




(41)x﹣x=14,




(42)3x﹣x=,




(43)=,




(44):=,




(45)=:,




(46):=x:,




(47)x=+1,




(48)1﹣25%X+25%x=+25%x,




=,
(49)





×X=,
(50)





(51) 5:8=x:32,






(52)2x+3×=,





(53)﹣=,




(54)×(7﹣)=,


(55)x:=:,





(56)150%x+66=99





(57)x+6﹣=16






(58)






(59)




(60)3÷(X﹣)=





(61)(X+):2=(X﹣4):,




(62) X÷=,



(63)2X﹣4×6=80,




(64)4×﹣3X=,




(65)4X﹣=10,




(66)+X=20,




(67)×12+15X=,




(68)6X+5=17,




(69)×(+X)=,





(70):=X:,




(71),




(72)




(73),




(74)4(+x)=,




(75)×+x=,




(76)x﹣,




(77)200:6=x:,




(78)4÷X=,




(79)8(x﹣2)=2(x+7),





(80):18%=,





﹣2x=,
(81)





x+x=46,
(82)





(83):x=:,




(84)=,




(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)





(86)=,




(87)8(2X﹣7)=5(X+13),



(88)3(x+)=60,







(89)+=,






(90)3(x﹣)=,





(91)﹣5x=,





(92)x:=






(93)+2x=,





(94)x=15%,



(95)x﹣x=,



(96)x+50%x=6,




(97):x=:12,




(98)4x+2(8﹣x)=26,





(99)x﹣=0,




(100)+x=1,





(101)x×(+)=,




(102),




(103),




(104)x﹣,




(105)x×,





(106)5x+35=650,





(107)720÷3x=80,





(108)﹣=,





(109)4×﹣3x=6,





(110)=,





(111)6×3﹣=,



(112)÷x=,




(113)x÷=42,




(114)x+=,




(115)7x÷3=,




(116)12:=x:,




(117)3(x+2)=4(x+1),





(118)3x﹣70%x=,





(119) 6+x=240,






(120)﹣=,




(121)x:=4:2,





(122)x﹣﹣6=16,




(123):=x:8,




(124),




(125)x:15=:,




(126)x+x=,




(127)x×50%﹣x=5,





(128)1﹣x=,




(129)+1x=3,




(130)3x﹣2=4,




(131)﹣3x=2,




(132)3÷x=4,




(133)x﹣5%=,





(134):=:(4﹣x),





(135) 6x+31=49,




(136) 7x÷3=,





(137) ﹣9x=,





(138) x﹣=16,





(139) 6×7+3x=69,





(140) 6x+2x﹣56=0,






(141) 3x﹣×4=,





(142) ﹣=,






(143) ÷(9﹣x)=3,





(144) 3x÷=8,




(145)5x+28=71,




(146)﹣=,




(147)8x﹣=,




(148)﹣×4=,




(149)54÷2+3x=72,





(150)8x﹣=,




(151)x÷=,




(152)x+30%x=26,






(153) ﹣3x=,




(154) 6×3﹣=,




(155)10:x=:,




(156):=x:,




(157)X﹣=,




(158)﹣X=,




(159)X﹣(+)=,





(160)÷x=,





(161)=,




(162)x﹣80%x=48,




(163)75%x﹣5×=6,




(164)x﹣=,





(165)=,




(166)﹣y=,




(167)5x+=,




(168) x﹣=,





(169) 9x+5x=,




(170) +=,




(171)5÷x=,




(172)﹣x=,




(173)×﹣3x=,




(174)(1+25%)x=,





(175)x﹣40%x=9,





(176)x×20%=,





(178)x﹣x=,





(179)x÷75%=3,



(180)4x﹣,






(181):x=:,




(182)(x﹣)×6=,





(183)27﹣17x=,





(184)+3x=×5,





(185)2x+5=5x﹣7,





(186) 3(x﹣2)=2﹣5(x﹣2),





(187)4x﹣3(20﹣x)+4=0,





(188)﹣=1,





(189)4x﹣5×6=12,





(190)8x﹣3x=,





(191)30×(x÷4)=60,





(192)×﹣3x=,





(193)5x﹣×5=8,





(194)+x=×2,




(195)5x+×15=66,





(196)+=1,






(197)×16-8x=12,







(198)=,





(199)5(x+6)=75,





(200)x÷+×3=4,






































解方程专项练习200题
答案:
(1)x﹣=,
=,



x=;

(2) x××=,
x=,


x×21=×21,

x=12;

(3) ﹣4x=,
﹣4x+4x=+4x,
=+4x,
÷4=4x÷4,

x=.
(4) 8×﹣2x=
20﹣2x=,
+2X=20,
2X=,
x=;
(5) :x=3:5,
3x=×5,
3x=,
x=
(6)1﹣20%x=,
1﹣20%x+20%x=+20%x,
+20%x=1,
+20%x﹣=1﹣,
20%x=,
20%x×=×,
x=3;
(8) 1÷(x﹣)=6,
1÷(x﹣)×(x﹣)=6×(x﹣),
1=6×(x﹣),
6x﹣6×=1,
6x﹣3=1,
6x=4,
6x÷6=4÷6,
x=
(9)2x﹣x=,

x(2﹣)=,
x=,

x÷=÷,

x=1;

(10)9×3﹣=,
27﹣=,
27﹣+=+,
+=27,
+﹣=27﹣,
=,
÷=÷,
x=8
(11)x﹣25%x=24,
75%x=24,
75%x÷75%=24÷75%,
x=32;

(12)x﹣+=,
x﹣=,
x﹣+=+,
x=,
x÷=÷,
x=1


(13)+90%x=78,
=78,
÷=78÷,
x=52;

(14)20%x﹣×3=,
20%x﹣=,
20%x﹣+=+,
20%x÷20%=8÷20%,
x=40;

(15)x﹣x=42,
x=42,

x÷=42÷,

x=252
(16)+3×=,
+=,
+﹣=﹣,
=60,
÷=60÷,
x=100;


(17)1÷(x﹣)=5,
÷(x﹣)×(x﹣)=(x﹣),
x﹣=,

x﹣+=+,
x=4,


x÷=4÷,
x=
(18)x﹣=,
x﹣+=+,
x=;
(19):x=3:12,
3x=×12,
3x÷3=9÷3,
x=3
(20)x+=,



x+﹣=﹣,

x=,

x×=×,

x=8.
(21) :x=1:,
x=×,
x=
(22) x×(2﹣)=24,
x×=24,
x×÷=24÷,
x=20;
(23) 4x﹣=3,
4x﹣+=3+,
4x=4,
4x÷4=4÷4,
x=1
(24)12x+7×=,
12x+=,
12x+﹣=﹣,
12x÷12=18÷12,
x=;
(25)x+x=,
x=,

x×,

x=;
(26)x:42=,
10x=42×,
10x÷10=30÷10,
x=3


(27)×+x=,
+x=,
+x﹣=﹣,
x=3,

x÷=3÷,

x=6;

(28):=:x,
=×,
=,
÷=÷,
x=
(29)χ﹣χ=,
x=,

x=,

x=3;

(30)42:=χ:
x=42×,
x=30,
x=50;

(31)5x﹣=75%,
5x﹣+=75%+,
5x÷5=÷5,
x=


( 32) 6x﹣=,
6x﹣+=+,
6x=,
6x÷6=÷6,
x=;

(33)2(x﹣3)=,
2(x﹣3)÷2=÷2
x﹣3=,
x﹣3+3=+3,
x=;
(34) =,
÷=÷,
x=4;
(35) 4x﹣3×9=29,
4x﹣27=29,
4x﹣27+27=29+27,
4x=56,
4x÷4=56÷4,
x=14;
(36)16+8x=40,
16+8x﹣16=40﹣16,
8x=24,
8x÷8=24÷8,
x=3;
(37) x÷=3,
x÷×=3×,
x=
(38)+2x=,
+2x=,
2x=,
2x÷2=÷2,
x=;
(39)×3﹣7x=,
﹣7x=,
﹣7x﹣=﹣,
﹣7x=0,
7x÷7=÷7,
x=;



(40)x﹣1﹣x=2,
x﹣1=2,

x﹣1+1=2+1,

x=3,

x=3,

x=18;
(41)x﹣x=14,
x=14,
x=14,
x=18;
(42)3x﹣x=,
x=,
x=,
x=;
(43)=,
=72×,
=,
÷=÷,
x=;
(44):=,
x=×5,
x=6,
x=6,
x=9;
(45)=:,
x=18×,
x=,
x=,
x=12;
(46):=x:,
x=×,
x=,
x=;
(47)x=+1,
x×=×,
x=1
(48) 1﹣25%X+25%x=+25%x,
+﹣=1﹣,
=,
x=3;
=,
(49)
=×,
÷=×÷,
x=8;
×X=,
(50)
×X÷=,
x=;
(51) 5:8=x:32,
8x=5×32,
8x÷8=5×32÷8,
x=20
(52)2x+3×=,
2x+=,
2x+﹣=﹣,
2x÷2=÷2,
x=;
(53)﹣=,
=,
÷=÷,
x=;
(54)×(7﹣)=,
×(7﹣)=,
7﹣=,
7﹣+=+,
7﹣=+﹣,
÷=÷,
x=;
(55)x:=:,
x=×,
x=,
x=
(56) 150%x+66=99
+66=99
=33
x=22
(57)x+6﹣=16
+6=16
=10
x=50


(58)


x=


(59)
=
x=10
(60)3÷(X﹣)=
3÷(X﹣)×(x﹣)=×(x﹣),
3=﹣,
3+=﹣+,
=,
÷=÷,
x=;
(61)(X+):2=(X﹣4):,
×(x﹣4)=(x+)×,
x﹣×4=x+×,
x﹣10﹣x=x+x,


﹣10+10=+10,
÷=÷,
x=
(62) X÷=,
X÷×=×,
X=;

(63)2X﹣4×6=80,
2X﹣24=80,
2X﹣24+24=80+24,
2X=104,
2X÷2=104÷2,
X=52;
(64)4×﹣3X=,
18﹣3X=,
18﹣3X+3X=+3X,
+3X=18,
+3X﹣=18﹣,
3X=,
3X÷3=÷3,
X=;
(65)4X﹣=10,
4X﹣+=10+,
4X=,
4X÷4=÷4,
X=;
(66)+X=20,
=20,
÷=20÷,
X=;
(67)×12+15X=,
+15X=,
+15X﹣=﹣,
15X=42,
15X÷15=42÷15,
X=
(68)6X+5=17,
6x+5﹣5=17﹣5,
6x÷6=12÷6,
x=2;

(69)×(+X)=,
×(+X)÷=÷,
+x=7,
+x﹣=7﹣,
x=;

(70):=X:,
x=×,

x÷=,

x=


(71),





(72)





(73),





(74)4(+x)=,
+4x=,
+4x﹣=﹣,
4x=4,
x=1;
(75)×+x=,
+x=,
+x﹣=﹣,
x=,

x=

(76)x﹣,




x=;

(77)200:6=x:,
6x=200×,
6x÷6=480÷6,
x=80

(78)4÷X=,
4÷X×X=X,
X=4,

X÷=4÷,

X=10;

(79)8(x﹣2)=2(x+7),
8X﹣16=2X+14,
6X﹣16=14,
6X=30,



X=5;

(80):18%=,
X=×,

X=,

X=

﹣2x=,
(81)
﹣2x+2x=+2x,

+2x=,

+2x﹣=﹣,

2x=,
2x÷2=÷2,
x=;
x+x=46,
(82)
x(+)=46,
x=46,

x÷=46÷,

x=40;

(83):x=:,
x=×,

x=,

x÷=÷,

x=;

(84)=,
=×2,
=,
÷=÷,
x=8

(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)
15x﹣20﹣2x+2=10x﹣5,
13x﹣18=10x﹣5,
13x﹣18﹣10x=10x﹣5﹣10x,
3x﹣18=﹣5,
3x﹣18+18=﹣5+18,
3x=13,
3x÷3=13÷3,
x=;
(86)=,
3(6x﹣1)=64,
18x﹣3=64,
18x﹣3+3=64+3,
18x=67,
18x÷18=67÷18,
x=
(87)8(2X﹣7)=5(X+13),
16x﹣56=5x+65,
16x﹣56﹣5x=5x+65﹣5x,
11x﹣56=65,
11x﹣56+56=65+56,
11x=121,
11x÷11=121÷11,
x=11,

(88)3(x+)=60,
3(x+)÷3=60÷3,
x+=20,
x+﹣=20﹣,
x=
(89)+=,
+﹣=﹣,
=,
÷=÷,
x=;

(90)3(x﹣)=,
3x﹣=,
3x﹣+=+,
3x=,
3x÷3=÷3,
x=;

(91)﹣5x=,
﹣5x+5x=+5x,
+5x=,
+5x﹣=﹣,
5x=,
5x÷5=÷5,
x=

(92) x:=
25x=×

3,
25x=,

25x÷25=,
x=;

(93)+2x=,
+2x=,
2x=0,
x=0;
(94)x=15%,
x×x=15%x,
=,


÷=÷,
x=1;
(95)x﹣x=,
x=,
x=,
x=.

(96)x+50%x=6,
=6,
÷=6÷,
x=4;
(97):x=:12,
=,
÷=9÷,
x=30;
(98)4x+2(8﹣x)=26,
4x+16﹣2x=26,
2x+16=26,
2x+16﹣16=26﹣16,
2x÷2=10÷2,
x=5
(99)x﹣=0,
x﹣+=0+,
x=,
x×3=×3,
x=;
(100)+x=1,
+x﹣=1﹣,
x=,
x×=×,
x=1;
(101)x×(+)=,
x=,
x×=×,
x=.
(102),


3x÷3=,
x=;
(103),



x=20;
(104)x﹣,


x=;
(105)x×,
x×,
x=
(106)5x+35=650,
5x+35﹣35=650﹣35,
5x=615,
5x÷5=615÷5,
x=123;
(107)720÷3x=80,
720÷3x×3x=80×3x,
240x=720,
240x÷240=720÷240,
x=3;
(108)﹣=,
(﹣)x=,
=,
÷=÷,
x=3;

(109)4×﹣3x=6,
18﹣3x=6,
18﹣3x+3x=6+3x,
6+3x=18,
6+3x﹣6=18﹣6,
3x=12,
3x÷3=12÷3,
x=4
(110)=,
=10×,
÷=8÷,
x=;

(111)6×3﹣=,
18﹣=,
18﹣+=+,
+=18,
+﹣=18﹣,
=,
÷=÷,
X=6
(112)÷x=,
x=÷,
x=;

(113)x÷=42,
x=42×,
x=9;

(114)x+=,
x+﹣=﹣,


x=,

x÷=÷,

x=
(115)7x÷3=,
7x÷3×3=×3,
7x=,
7x÷7=÷7,
x=;
(116)12:=x:,
=12×,
=6,
÷=6÷,
x=10;

(117)3(x+2)=4(x+1),
3x+6=4x+4,
3x+6﹣3x=4x+4﹣3x,
x+4=6,
x+4﹣4=6﹣4,
x=2


(118)3x﹣70%x=,
3x﹣=,
=,
÷=÷,
x=4;
(119) 6+x=240,
6+x﹣6=240﹣6,
x=234,

x÷=234÷,
x=390
(120)﹣=,
﹣+=+,
+=,
+﹣=﹣,
÷=10÷,
x=25;
(121)x:=4:2,
2x=×4,
2x÷2=14÷2,
x=6
(122)x﹣﹣6=16,
﹣6=16,
﹣6+6=16+6,
÷=22÷,
x=110;
(123):=x:8,
x=8×,
x×=8××,
x=4;

(124),
=2×,
÷=÷,
x=;
(125)x:15=:,
x=15×,
x×6=15××6,
x=40;
(126)x+x=,
x=,
x×=×,
x=;
(127)x×50%﹣x=5,
x=5,

x×6=5×6,

x=30;
(128)1﹣x=,
1﹣x+x=+x,
+x=1,

+x﹣=1﹣,

x×=×,

x=;
(129)+1x=3,
+1x﹣=3﹣,
x=,

x×=×,

x=
(130)3x﹣2=4,
3x﹣2+2=4+2,
3x=6,
3x÷3=6÷3,
x=;
(131)﹣3x=2,
﹣3x+3x=2+3x,
3x+2=,
3x+2﹣2=﹣2,
3x=6,
3x÷3=6÷3,
x=2;
(132)3÷x=4,
3÷x×x=4×x,
4x=3,
4x÷4=3÷4,
x=
(133)x﹣5%=,
解:x﹣5%+5%=+5%,




x=,
x=23;
(134):=:(4﹣x),
解:4x=,
2﹣x+x=x,
2﹣+x,
=x,

x=3
(135) 6x+31=49,
6x+31﹣31=49﹣31,
6x=18,
6x÷6=18÷6,
x=3;
(136) 7x÷3=,
7x÷3×3=×3,
7x=,
7x÷7=÷7,
x=;
(137) ﹣9x=,
﹣9x+9x=+9x,
+9x=,
+9x﹣=﹣,
9x=,
9x÷9=÷9,
x=;
(138) x﹣=16,
(1﹣)x=16,
=16,
÷=16÷,
x=25;
(139) 6×7+3x=69,
42+3x=69,
42+3x﹣42=69﹣42,
3x=27,
3x÷3=27÷3,
x=9;
(140) 6x+2x﹣56=0,
(6+2)x﹣56+56=0+56,
8x=56,
8x÷8=56÷8,
x=7
(141) 3x﹣×4=,
3x﹣=,
3x﹣+=+,
3x=,
3x÷3=÷3,
x=;
(142) ﹣=,
=,
÷=÷,
x=;
(143) ÷(9﹣x)=3,
9﹣x=÷3,
9﹣x=,
x=9﹣,
x=;
(144) 3x÷=8,
3x÷×=8×,
3x=,
3x÷3=÷3,
x=
(145)5x+28=71,
5x+28﹣28=71﹣28,
5x=43,
5x÷5=43÷5,
x=;

(146)﹣=,
﹣+﹣=+﹣,
=,
=,
÷=÷,
x=4;
(147)8x﹣=,
=,
÷=÷,
x=7;

(148)﹣×4=,
﹣=,
﹣+=+,
=,
÷=÷,
x=,;
(149)54÷2+3x=72,
27+3x=72,
27+3x﹣27=72﹣27,
3x=45,
3x÷3=45÷3,
x=15;

(150)8x﹣=,
8x﹣+=+,
8x=,
8x÷8=÷8,
x=

(151)x÷=,




x÷×=×,
x=,
x×4=×4,
x=;
(152)x+30%x=26,
(1+30%)x=26,
=26,
÷=26÷,
x=20;
(153) ﹣3x=,
﹣3x+3x=+3x,
+3x=,
+3x﹣=﹣,
3x=,
3x÷3=÷3,
x=
(154) 6×3﹣=,
18﹣=,
18﹣+=+,
18=+,
18﹣=+﹣,
=,
÷=÷,
x=6;
(155)10:x=:,
=10×,
=8,
÷=8÷,
x=;
(156):=x:,
x=×,

x=,

x÷=÷,

x=
(157)X﹣=,
X﹣+=+,
X=;
(158)﹣X=,
﹣X+X=+X,
X+=,
X+﹣=﹣,
X=20;
(159)X﹣(+)=,
X﹣=,
X﹣+=+,
X=
(160)÷x=,
÷x×x=×x,

x=,

x÷=÷,
x=×,
x=;
(161)=,
+=+,
=20,

×8=20×8,

x=160

(162)x﹣80%x=48,
(1﹣)x=48,
=48,
÷=48÷,
x=240;

(163)75%x﹣5×=6,
﹣3=6,
﹣3+3=6+3,
=9,
÷=9÷,
x=12
(164)x﹣=,
x﹣+=+,
x=;

(165)=,
÷=÷,
x=3;

(166)﹣y=,
=,
÷=÷,
y=;
(167)5x+=,
5x+﹣=﹣,
5x=5,
5x÷5=5÷5,
x=1
(168) x﹣=,
x﹣+=﹣,
x=;
(169) 9x+5x=,
14x=,
14x÷14=÷14,
x=;
(170) +=,
﹣+=﹣,
=8,
÷=8÷,






x=
(171)5÷x=,
5÷x×x=x,
5=x,
5÷=x÷,
x=;
(172)﹣x=,
﹣x+x=+x,
=+x,

﹣=+x﹣,
=x,

÷==x÷,
x=1;

(173)×﹣3x=,
﹣=,
﹣+=+,
=+,
﹣=+﹣,
0=,
0÷=÷,
x=0
(174)(1+25%)x=,
=,
÷=÷,
x=;

(175)x﹣40%x=9,
=9,
÷=9÷,
x=15;

(176)x×20%=,
x×20%÷20%=÷20%,
x=76
(177)30x﹣30=180,
30x﹣30+30=180+30,
30x=210,
30x÷30=210÷30,
x=7;
(178)x﹣x=,
x=,

x÷=÷,

x=;

(179)x÷75%=3,
x÷75%×75%=3×75%,
x=,

x÷=÷,

x=
(180)4x﹣,
4x﹣6=,
4x=+6,
x=÷4,
x=.
(181):x=:,
x=×,

x=2,

x=2×,
x=5

(182)(x﹣)×6=,
6x﹣×6=,
6x﹣27=,
6x﹣27+27=+27,
6x=,
6x÷6=÷6,
x=6;
(183)27﹣17x=,
27﹣17x+17x=+17x,
+17x=27,
+17x﹣=27﹣,
17x=,
17x÷17=÷17,
x=;
(184)+3x=×5,
+3x﹣=﹣,
3x=,
3x÷3=÷3,
x=
(185)2x+5=5x﹣7,
2x+5﹣2x=5x﹣7﹣2x,
3x﹣7=5,
3x﹣7+7=5+7,
3x=12,
3x÷3=12÷3,
x=4;
(186) 3(x﹣2)=2﹣5(x﹣2),
3x﹣6=12﹣5x,
3x﹣6+5x=12﹣5x+5x,
8x﹣6=12,
8x﹣6+6=12+6,
8x=18,
8x÷8=18÷8,
x=;

(187)4x﹣3(20﹣x)+4=0,
7x﹣56=0,






7x﹣56+56=0+56,
7x=56,
7x÷7=56÷7,
x=8;

(188)﹣=1,
(﹣)×24=1×24,
6(y+2)﹣4(2y﹣3)=24,
30﹣2y=24,
30﹣2y+2y=24+2y,
2y+24=30,
2y+24﹣24=30﹣24,
2y=6,
2y÷2=6÷2,
y=3
(189)4x﹣5×6=12,
4x﹣30=12,
4x﹣30+30=12+30,
4x=42,
4x÷4=42÷4,
x=;

(190)8x﹣3x=,
5x=,
5x÷5=÷5,
x=;

(191)30×(x÷4)=60,
30×(x÷4)÷30=60÷30,
x÷4=2,
x÷4×4=2×4,
x=8;

(192)×﹣3x=,
﹣3x=,
﹣3x+3x=+3x,
3x+=,
3x+﹣=﹣,
3x=,
3x÷3=÷3,
x=

(193)5x﹣×5=8,
5x﹣12+12=8+12,
5x=20,
5x÷5=20÷5,
x=4,

(194)+x=×2,
x=,
x×=×,
x=.
(195)5x+×15=66,
5x+36=66,
5x+36-36=66-36,
5x=30,
5x÷5=30÷5,
x=6;
(196)+=1,
5x=1,
5x÷5=1÷5,
x=;
(197)×16-8x=12,
40-8x=12,
40-8x+8x=12+8x,
8x+12=40,
8x+12-12=40-12,
8x=28,
8x÷8=28÷8,
x=.
(198)=,
+3x=+3x,
+3x=,
+=,
3x=,
3x÷3=÷3,
x=;
(199)5(x+6)=75,
5x+30=75,
5x+30-30=75-30,
5x=45,
5x÷5=45÷5,
x=9;
(200)x÷+×3=4,
x÷+=4,
x÷+,
x÷=,
x÷×=×,
x=.



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