Linear Algebra Examples

$[\begin{array}{c} x & - \frac{1}{3} & - \frac{1}{3} \\ - \frac{1}{3} & x & - \frac{1}{3} \\ - \frac{1}{3} & - \frac{1}{3} & x \end{array}]$

Step 1

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$[\begin{array}{c} x & - \frac{1}{3} & - \frac{1}{3} \\ - \frac{1}{3} & x & - \frac{1}{3} \\ - \frac{1}{3} & - \frac{1}{3} & x \end{array}]$