Linear Algebra Examples

$[\begin{array}{c} 5 & - 10 & 25 & - 20 \\ 1 & - 2 & 5 & - 4 \\ 3 & - 6 & 15 & 12 \end{array}]$

Step 1

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$[\begin{array}{c} 5 & - 10 & 25 & - 20 \\ 1 & - 2 & 5 & - 4 \\ 3 & - 6 & 15 & 12 \end{array}]$