Tìm số nguyên x biết (x - 28) : (-12) = -5

* Hướng dẫn giải

$\begin{array}{l}\left(\mathrm{x}-\text{28}\right):\left(-\text{12}\right)=-\text{5}\\ \mathrm{x}-28=-\text{5}.\left(-\text{12}\right)\\ \mathrm{x}-\text{28} =\text{ 6}0\\ \mathrm{x}=\text{ 6}0+\text{28}\\ \mathrm{x}=\text{ 88}\end{array}$