Đáp án đúng: B
Giải chi tiết:\(\begin{array}{l}42 + 2.\left( {x - 5} \right) = 70\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2.\left( {x - 5} \right) = 70 - 42\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2.\left( {x - 5} \right) = 28\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x - 5 = 28:2\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x - 5 = 14\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\, = 14 + 5\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\, = 19\end{array}\)
Chọn B.
