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$\left.X\left([tex]\begin{array}{rrr}-3 & 4 & 0 \\ 1 & 1 & -2 \\ -2 & -1 & 3\end{array}\right)=\left(\begin{array}{rrr}-5 & 4 & 2 \\ 1 & 7 & -7\end{array}\right) ; [/tex]