\(\Leftrightarrow\left\{{}\begin{matrix}3a-6+5b=25\\6a-b+2=5\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}3a+5b=31\\6a-b=3\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}6a+10b=62\\6a-b=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}6a-b=3\\11b=59\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}a=\dfrac{46}{33}\\b=\dfrac{59}{11}\end{matrix}\right.\)
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