Tìm số nguyên x biết (x +15) : (-28) = 8

* Hướng dẫn giải

$\begin{array}{l}\left(\mathrm{x}+\text{15}\right):\left(-\text{28}\right)=\text{ 8}\\ \mathrm{x}+\text{15 }=\text{8}.\left(-\text{28}\right)\\ \mathrm{x}+\text{15 }=-\text{ 224}\\ \mathrm{x}=-\text{224 }–\text{ 15}\\ \mathrm{x}=-\text{239}\end{array}$