2x + 7 = 135
=> 2x = 128
=> x = 64
giải
2x+7=135
2x=135-7
2x=128
x=128:2
x=64
vậy x=64
2x+7=135
2x=135-7
2x=128
x=128:2=64
vậy x=64
(2x+7)=135
2x=135-7
2x=128
x=128:2
x=64
very easy 
\(\left(2x+7\right)=135\)
\(2x+7=135\)
\(2x=135-7\)
\(2x=128\)
\(x=128:2\)
\(x=64\)
( 2x + 7 ) = 135
2x + 7 = 135
2x = 135 - 7
2x = 128
x = 128 ; 2
x = 64
vậy x = 64
