\(x+10⋮x+3\)
Mà \(x+3⋮x+3\)
\(\Leftrightarrow7⋮x+3\)
\(\Leftrightarrow x+3\inƯ\left(7\right)\)
\(\Leftrightarrow\left[{}\begin{matrix}x+3=1\\x+3=7\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=-2\left(loại\right)\\x=4\left(tm\right)\end{matrix}\right.\)
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