Finite Math Examples

$[\begin{array}{c} 1 & 0 & 0 & 1 & 19 \\ 0 & 1 & 0 & 5 & - 6 \\ 0 & 0 & 1 & 0 & - 1 \\ 0 & 0 & 0 & 0 & 0 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & 0 & 0 & 1 & 19 \\ 0 & 1 & 0 & 5 & - 6 \\ 0 & 0 & 1 & 0 & - 1 \\ 0 & 0 & 0 & 0 & 0 \end{array}]$