Algebra Examples

$[\begin{array}{c} 7 & 84 \\ 7 & - 38 \end{array}] [\begin{array}{c} - 7 \\ - 9 \\ 3 \end{array}]$

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$[\begin{array}{c} 7 & 84 \\ 7 & - 38 \end{array}] [\begin{array}{c} - 7 \\ - 9 \\ 3 \end{array}]$