\(\Leftrightarrow\left\{{}\begin{matrix}46a+46b+14b=20,5\\a+b=0,4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}46\left(a+b\right)+14b=20,5\\a+b=0,4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}46.0,4+14b=20,5\\a+b=0,4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}14b=2,1\\a+b=0,4\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}b=0,15\\a+0,15=0,4\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}b=0,15\\a=0,25\end{matrix}\right.\)
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