$$\left[\begin{matrix} -4 & 6 \\5 & -2 \end{matrix}\right] + \left[\begin{matrix} 3 & -2 \\-4 & 5 \end{matrix}\right]$$
$\left(\begin{matrix}-1&4\\1&3\end{matrix}\right)$
$$\left(\begin{matrix}-4&6\\5&-2\end{matrix}\right)+\left(\begin{matrix}3&-2\\-4&5\end{matrix}\right)$$
$$\left(\begin{matrix}-4+3&6-2\\5-4&-2+5\end{matrix}\right)$$
$$\left(\begin{matrix}-1&6-2\\5-4&-2+5\end{matrix}\right)$$
$$\left(\begin{matrix}-1&4\\5-4&-2+5\end{matrix}\right)$$
$$\left(\begin{matrix}-1&4\\1&-2+5\end{matrix}\right)$$
$$\left(\begin{matrix}-1&4\\1&3\end{matrix}\right)$$
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$-7$
