[tex]X + 3 \cdot \left[\begin{array}{cc}0&-4\\1&-1\end{array}\right] = \left[\begin{array}{cc}-1&-3\\6&7\end{array}\right] - \left[\begin{array}{cc}0&-4\\1&-1\end{array}\right]\\\\X + \left[\begin{array}{cc}0&-12\\3&-3\end{array}\right] = \left[\begin{array}{cc}-1&1\\5&8\end{array}\right]\\\\X = \left[\begin{array}{cc}-1&1\\5&8\end{array}\right] - \left[\begin{array}{cc}0&-12\\3&-3\end{array}\right]\\X = \left[\begin{array}{cc}-1&13\\2&11\end{array}\right][/tex]
