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Розв'язати систему рівнянь матричним методом
\begin{gather*}\left\{\begin{array}{l}x_1-2x_2+3x_3=-5, \\4x_1+2x_2-3x_3=0, \\7x_1-x_2+2x_3=-9.\end{array}\right.\end{gather*}