GIẢI
7 + (X +11) = 239 +116
7 + (X +11) = 355
X +11 = 355 - 7
X +11 = 347
X = 347 - 11
X = 336
CHO MÌNH NHÉ
7 + ( x + 11 ) = 239 + 116
7 + ( x + 11 ) = 355
x + 11 = 355 - 7
x + 11 = 348
x = 348 - 11
x = 337
\(7+\left(x+11\right)-116=239\Rightarrow x+11=239+116-7\Rightarrow x+11=348\Rightarrow x=348-11\)\(\Rightarrow x=337\)
7 + (x + 11) - 116 = 239
7 + (x + 11) = 239 + 116
7 + (x + 11) = 355
x + 11 = 355 - 7
x + 11 = 348
x = 348 - 11
x = 337