\(\left\{{}\begin{matrix}0,2x.\left(56-M\right)=3,2\\0,4x.\left(64-M\right)=8\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}11,2x-0,2Mx=3,2\\25,6x-0,4Mx=8\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}x=0,5\\M.x=12\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=0,5\\M=24\end{matrix}\right.\)