$$\left[\begin{matrix} 3 & -2 \\-4 & 5 \end{matrix}\right] + \left[\begin{matrix} 5 & 3 \\-2 & 4 \end{matrix}\right]$$
$\left(\begin{matrix}8&1\\-6&9\end{matrix}\right)$
$$\left(\begin{matrix}3&-2\\-4&5\end{matrix}\right)+\left(\begin{matrix}5&3\\-2&4\end{matrix}\right)$$
$$\left(\begin{matrix}3+5&-2+3\\-4-2&5+4\end{matrix}\right)$$
$$\left(\begin{matrix}8&-2+3\\-4-2&5+4\end{matrix}\right)$$
$$\left(\begin{matrix}8&1\\-4-2&5+4\end{matrix}\right)$$
$$\left(\begin{matrix}8&1\\-6&5+4\end{matrix}\right)$$
$$\left(\begin{matrix}8&1\\-6&9\end{matrix}\right)$$
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$78$
