231-(x-6)=103
x-6=231-103
x-6=128
x=128+6
x=134
231 - (x - 6) = 1339 :13
231 - ( x-6 ) = 103
x - 6 = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
231 - ( x - 6 ) = 1339 : 13
231 - ( x - 6 ) = 103
x - 6 = 103+231
x - 6 = 334
x = 334 + 6
x = 340
231 - ( x - 6 ) = 1339 : 13
231 - ( x - 6 ) = 103
x - 6 = 103+231
x - 6 = 334
231-(x-6)=1339:13
231+6-x=103
237-x=103
x=134
\(231-\left(x-6\right)=1339\div13\)
\(\Leftrightarrow231-\left(x-6\right)=103\)
\(\Leftrightarrow x-6=128\)
\(\Leftrightarrow x=134\)
Vậy x = 134
231 - (x - 6) = 1339 : 13
231 - (x- 6 ) = 103
x - 6 = 231-103 = 128
x = 128 + 6 = 134