[tex]\bf 8.\\ \\ \it a)\ \ |x+5|=-10 < 0 \Rightarrow ecua\c{\it t}ie\ imposibil\breve a\\ \\ \\ b)\ \ |12-3x|-2=-2\bigg|_{+2} \Rightarrow 3|4-x|=0 \Rightarrow 4-x=0 \Rightarrow x=4\in\mathbb Z[/tex]
[tex]\bf 10.\\ \\ \it -3x+2y=xy-6 \Rightarrow 6-3x+2y-xy=0 \Rightarrow 3(2-x)+y(2-x)=0 \Rightarrow \\ \\ \Rightarrow (2-x)(3+y)=0 \Rightarrow \begin{cases} \it 2-x=0 \Rightarrow x=2,\ \ y\in\mathbb Z\\ \\ sau\\ \\ \it 3+y=0 \Rightarrow y=-3,\ \ x\in\mathbb Z\end{cases}[/tex]
