<!--
Matrix Multiplication

GS LaTeX Code
$$$
\begin{pmatrix}
   2 & 3 & -2 \\
   1 & -1 & -3 
\end{pmatrix}

\begin{pmatrix}
   x_1 \\
   x_2 \\
   x_3 \\
\end{pmatrix}

= 

\begin{pmatrix}
   7 \\
   5 \\
\end{pmatrix}
$$$
-->

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            x_2 \\
            x_3 \\
            \end{pmatrix}
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            5 \\
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