Linear Algebra Examples

$[\begin{array}{c} 1 & 0 & 0 \\ 0 & r - 6 & 6 \\ 0 & s - 5 & r + 6 \\ 0 & 0 & 7 \end{array}]$

Step 1

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$[\begin{array}{c} 1 & 0 & 0 \\ 0 & r - 6 & 6 \\ 0 & s - 5 & r + 6 \\ 0 & 0 & 7 \end{array}]$