Finite Math Examples

$\frac{7 + 2 x}{7} = y$ , $7 z - 2 (x - 5 y) = 0$ , $4 x - y = 3 (x - 7 z)$

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$\frac{7 + 2 x}{7} = y, 7 z - 2 (x - 5 y) = 0, 4 x - y = 3 (x - 7 z)$