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[latex] \left[\begin{array}{ccc}-1&-2&1\\5&2&1\\x&y&1\end{array}\right] = -2 -x +y -x +y -10 = -2x +2y -12[/latex]
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[latex] \left[\begin{array}{ccc}-1&-2&1\\5&2&1\\x&y&1\end{array}\right] = -2 -x +y -x +y -10 = -2x +2y -12[/latex]