Finite Math Examples

$[\begin{array}{c} - 21 & 6 & 12 & - 6 \\ - 7 & 2 & 4 & - 2 \end{array}]$

Step 1

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$[\begin{array}{c} - 21 & 6 & 12 & - 6 \\ - 7 & 2 & 4 & - 2 \end{array}]$