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a) 5x - 14 = x - 34
5x - x = -34 + 14
4x = -20
x = -20 : 4
x = -5
b) x - 3 - (3x + 2) = -15
x - 3 - 3x - 2 = -15
x - 3x = -15 + 3 + 2
-2x = -10
x = (-10) : (-2)
x = 5
c) 2(x - 12) + 19 = x + (-34)
2x - 24 + 19 = x + (-34)
2x - x = -34 + 24 - 19
x = -29
d) 2(x - 33) - 3(x - 43) = 96 - 115
2x - 66 - 3x + 129 = 96 - 115
2x - 3x = 96 - 115 + 66 - 129
-x = -82
x = 82
e) 2x + 3 - 9x = -11
2x - 9x = -11 - 3
-7x = -14
x = (-14) : (-7)
x = 2
f) -(x + 3 - 84) = (x + 70 - 71) - 6
-x - 3 + 84 = x + 70 - 71 - 6
-x - x = 70 - 71 - 6 - 84
-2x = -91
x = (-91) : (-2)
x = 45,5
34+(21-x)=(3747-30)-3746
34+(21-x)=3717-3746
34+(21-x)=-29
21-x=-29-34
21-x=-63
x=21-(-63)
x=21+63
x=84
(x+153)-(48-193)=1-2-3-4
(x+153)-(48-193)=-8
(x+153)-(-145)=-8
(x+153)+145=-8
x+153=-8-145
x+153=-153
x=-153-153
x=0
35-(x+5)=315-(2x+135)
213-(x+84)= -161
x+84=213-(-161)
x+84=213+161
x+84=374
x=374-84
x=290
a) x - 96 = (443 - x) - 15
x - 96 = 443 - x - 15
x + x = 443 -15 + 96
2x = 524
x = 524 : 2
x = 262
b) (x -12) - 15 = (20 - 7) - (18 + x)
x - 12 - 15 = 20 - 7 - 18 - x
x + x = 20 - 7 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
c) 311 - x + 82 = 46 + (x - 21)
311 - x + 82 = 46 + x - 21
-x - x = 46 - 21 - 311 - 81
-2x = -367
x = -367 : (-2)
x = 183,5
d) -(x - 3 + 85) = (x + 70 - 71) - 5
-x + 3 - 85 = x + 70 - 71 - 5
-x - x = 70 - 71 - 5 - 3 + 85
-2x = 76
x = 76 : (-2)
x = -38
e,f làm tương tự
a) x - 96 = (443 - x) - 15
x - 96 = 443 - x - 15
x + x = 443 -15 + 96
2x = 524
x = 524 : 2
x = 262
b) (x -12) - 15 = (20 - 7) - (18 + x)
x - 12 - 15 = 20 - 7 - 18 - x
x + x = 20 - 7 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
c) 311 - x + 82 = 46 + (x - 21)
311 - x + 82 = 46 + x - 21
-x - x = 46 - 21 - 311 - 81
-2x = -367
x = -367 : (-2)
x = 183,5
d) -(x - 3 + 85) = (x + 70 - 71) - 5
-x + 3 - 85 = x + 70 - 71 - 5
-x - x = 70 - 71 - 5 - 3 + 85
-2x = 76
x = 76 : (-2)
x = -38
e,f làm tương tự
a, (x-12) -15 = (20-7) - (18+x)
<=> x - 12 - 15 = 13 - 18 - x
<=> 2x = 22
<=> x = 11
b, x- 96 = ( 443 - x) - 15
<=> x - 96 = 443 - x - 15
<=> 2x = 524
<=> x = 262
c, 311 - x + 82 = 46 + ( x- 21)
<=> 311 - x + 82 = 46 + x - 21
<=> 2x = 368
<=> x = 184
e, ( - x + 821 + 534 ) = 499 + ( x-84)
<=> - x + 821 + 534 = 499 + x - 84
<=> 2x = 940
<=> x = 470
f, x + 96 = ( 443 - x) - 447
<=> x + 96 = 443 - x - 447
<=> 2x = - 100
<=> x = - 50
a, x - 96 = ( 443 - x ) - 15
x - 96 = 443 - x - 15
x - 96 = 428 - x
x + x = 428 + 96
2x = 524
x = 262
b, ( x - 12 ) - 15 = ( 20 - 7 ) - ( 18 - x )
x - 12 - 15 = 13 - 18 + x
x - 27 = - 5 + x
x - x = - 5 + 27
0x = 22
=> ko có giá trị nào thõa mãn
c, 353 - x = 46 + ( 3x - 21 )
353 - x = 46 + 3x - 21
353 - x = 25 + 3x
- x - 3x = 25 - 353
- 4x = - 328
x = 82
d, - ( x + 81 ) = ( 2x +12 ) - ( 5 + x )
- x - 81 = 2x + 12 - 5 - x
- x - 81 = x + 7
- x - x = 7 + 81
- 2x = 88
x = - 44
e, ( - x + 821 + 534 ) = 499 + ( x - 84 )
- x + 1355 = 499 + x - 84
- x - x = 499 - 84 - 1355
- 2x = - 940
x = 470
g, x + 53 = ( 400 - 9x ) - 447
x + 53 = 400 - 9x - 447
x + 53 = - 47 - 9x
x + 9x = - 47 - 53
10x = -100
x = - 10
a) x-73=(57-x)-467
<=>x+x=57+73-467
<=>2x=-337
<=>x=-337/2
vậy ....
b) -(x - 3 - 84) = 70 - (-27) - 115
<=> -x + 3 + 84 = 70 +27 - 115
<=>-x=-105
<=>x=105
vậy ...
c) 231 - x + 62 = 46 + (x - 21)
<=> - x = 46 + x - 21-231-62
<=>-2x=-268
<=> x=134
vậy ...
d) -18 + x = -63 - (-33)
<=>x=-63+33+18
<=>x=-12
vậy ...
e) (x - 153) - (48 - 193) = 1 - 2 - 3 - 4
<=>x - 153 - 48 +193 = 1 - 2 - 3 - 4
<=> x= 0
vậy ...