Given \( \left[\begin{array}{rr}2 & 1 \\ -3 & 2\end{array}\right] \mathrm{A}+\left[\begin{array}...

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Given \( \left[\begin{array}{rr}2 & 1 \\ -3 & 2\end{array}\right] \mathrm{A}+\left[\begin{array}{rr}-5 & 0 \\ 2 & 4\end{array}\right]=\left[\begin{array}{rr}3 & -9 \\ 7 & 1\end{array}\right] \), find matrix \( \mathrm{A} \).
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