Tìm số nguyên x biết: 12 − ( x − 17 ) = 16 − 25 .

\(12 - \left( {x - 17} \right) = 16 - 25\)

\[\,\,\,\,12 - \left( {x - 17} \right) = \,\,\,\, - 9\]

\[\,\,\,\,\,\,\,\,\,\,\,\,x - 17\,\,\,\, = \,12 - \left( { - 9} \right)\,\,\]

\[\,\,\,\,\,\,\,\,\,\,\,\,x - 17\,\,\,\, = \,\,\,\,\,\,21\]

\[\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\, = \,\,\,21 + 17\]

\[\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\, = \,\,\,\,\,\,\,38\]

Vậy \[x = 38\].