a, \(231-\left(x-6\right)=1339:13\)
\(\Leftrightarrow231-\left(x-6\right)=103\)
\(\Leftrightarrow x-6=128\)
\(\Leftrightarrow x=134\)
Vậy .....
b, \(70-5\left(2x-3\right)=45\)
\(\Leftrightarrow5\left(2x-3\right)=25\)
\(\Leftrightarrow2x-3=5\)
\(\Leftrightarrow2x=8\)
\(\Leftrightarrow x=4\)
Vậy ....
c, \(156-\left(x+61\right)=82\)
\(\Leftrightarrow x+61=74\)
\(\Leftrightarrow x=13\)
Vậy ....
d, \(6\left(5x+35\right)=330\)
\(\Leftrightarrow5x+35=55\)
\(\Leftrightarrow5x=20\)
\(\Leftrightarrow x=4\)
Vậy ......
e, \(936-\left(4x+24\right)=72\)
\(\Leftrightarrow4x+24=864\)
\(\Leftrightarrow4x=840\)
\(\Leftrightarrow x=210\)
Vậy ...
231-(x-6)=1339:13
237-x=103
=>x=237-103=134
Vậy x=134
70-5(2x-3)=45
70-10x+15=45
=>-10x=45-15-70=-40
=>x=4
Vậy x=4
Các caau sau tương tự nhé bn
a, 231 - ( x - 6 ) = 1339 : 13
231 - ( x -6 ) = 103
x - 6 = 231 - 103 = 128
x = 128 + 6 = 134
b, 70 - 5 (2x -3 ) = 45
5 ( 2x -3 ) = 70 - 45 = 25
( 2x -3 ) = 25 : 5 = 5
2x = 5 + 3 = 8
x = 8 : 2 = 4
c, 156 - ( x + 61 ) = 82
x + 61 = 156 - 82 =74
x = 74 - 61
x = 13
d, 6 ( 5x + 35 ) = 330
5x + 35 = 330 : 6 = 55
5x = 55 - 35 = 20
x = 20 : 5 = 4
e, 936-(4x+ 24 ) = 72
4x + 24 = 936 - 72 = 864
4x = 864 - 24 = 840
x = 840 : 4 = 210
Chuc ban hoc tot nhe 
a)231-(x-6)=1339:13
231-(x-6)=103
x-6 =231-103
x-6 =128
x =128+6
x =134
Vậy x=134
b)70-5.(2x-3)=45
5.(2x-3)=70-45
5.(2x-3)=25
2x-3 =25:5
2x-3 =5
2x =5+3
2x =8
x =8:2
x =4
Vậy x=4.
c)156-(x+61)=82
x+61=156-82
x+61=74
x=74-61
x=13
Vậy x=13.
d)6.(5x+35)=330
5x+35=330:6
5x+35=55
5x=55-35
5x=20
x=20:5
x=4
Vậy x=4.
e)936-(4x+24)=72
4x+24=936-72
4x+24=864
4x=864-24
4x=840
x=840:4
x=210
Vậy x=210.