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![\left[\begin{array}{cc}5&9\\-6&9\end{array}\right] +\left[\begin{array}{cc}-30&12\\42&48\end{array}\right]](/tpl/images/0684/2325/4884c.png)
![\left[\begin{array}{cc}5-30&9+12\\-6+42&9+48\end{array}\right]](/tpl/images/0684/2325/dd158.png)
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