Finite Math Examples

$x + y - 9 z = 4$ , $x - y - 5 z = 0$ , $\frac{2}{5} x + 0 - \frac{14}{5} z = 7$

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$x + y - 9 z = 4, x - y - 5 z = 0, \frac{2}{5} x + 0 - \frac{14}{5} z = 7$