Linear Algebra Examples

$[\begin{array}{c} 2 & 2 & 1 \\ x & - 9 & 0 \\ 1 & 2 & 1 \end{array}]$

Step 1

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$[\begin{array}{c} 2 & 2 & 1 \\ x & - 9 & 0 \\ 1 & 2 & 1 \end{array}]$