\(\left(x+3\right)\left(y-3\right)=5\)
\(\Leftrightarrow x+3;y-3\inƯ\left(5\right)\)
\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x+3=1\\y-3=5\end{matrix}\right.\\\left\{{}\begin{matrix}x+3=5\\y-3=1\end{matrix}\right.\\\left\{{}\begin{matrix}x+3=-1\\y-3=-5\end{matrix}\right.\\\left\{{}\begin{matrix}x+3=-5\\y-3=-1\end{matrix}\right.\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x=-2\\y=8\end{matrix}\right.\\\left\{{}\begin{matrix}x=2\\y=4\end{matrix}\right.\\\left\{{}\begin{matrix}x=-4\\y=-2\end{matrix}\right.\\\left\{{}\begin{matrix}x=-8\\y=2\end{matrix}\right.\end{matrix}\right.\)
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