(Solved) Verify that the values of the variables listed are solutions of the system of
Question: Verify that the values of the variables listed are solutions of the system of equations.
\[\left\{ \begin{matrix} 4x+4y+3z=6 \\ x-y-z=0 \\ 2y-5z=-12 \\ {} \\ \end{matrix} \right.\]Is \((1,-1,2)\) a solution of the system of equations?
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