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| 1. |
3 \left[ \begin{array}{cc}{5} & {-6} \\ {4} & {x}\end{array}\right]-\left[ \begin{array}{cc}{6} & {y} \\ {0} & {6}\end{array}\right]=3 \left[ \begin{array}{cc}{3} & {-2} \\ {4} & {0}\end{array}\right] |
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