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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
a) x = -11
b) x = 2
c) x = -5
d) x = 5
e) x = 3 hoặc x = 7
f) x = -1 hoặc x = 9
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) \(x+546=46\\ x=46-546\\ x=-500\)
b) \(2x-19\times3=27\\ 2x-57=27\\ 2x=27+57\\ 2x=84\\ x=84:2\\ x=42\)
c) \(x+12=23+3\times3^4\\ x+12=23+3\times81\\ x=23+243-12\\ x=254\)
d) \(x-12=3-3\times2^4\\ x-12=3-3\times16\\ x=3-48+12\\ x=-33\)
e) \(\left(27-x\right)\left(x+9\right)=0\\ \Rightarrow\left[{}\begin{matrix}27-x=0\\x+9=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=27\\x=-9\end{matrix}\right.\)
f) \(\left(-x\right)\left(x-43\right)=0\\ \Rightarrow\left[{}\begin{matrix}-x=0\\x-43=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=0\\x=43\end{matrix}\right.\)
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 ...