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![\left[\begin{array}{ccc}-12&3\\-15&-9\\21&-15\end{array}\right]](/tpl/images/2357/6993/96844.png)
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![=\left[\begin{array}{ccc}-16&15\\-11&1\\15&-15&\end{array}\right]](/tpl/images/2357/6993/b465f.png)
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