Finite Math Examples

$5 x + 5 y - 15 z + s = 95$ , $6 x + 6 y + 18 z + s = 128$ , $- 4 x - 4 y + 12 + z = 0$

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$5 x + 5 y - 15 z + s = 95, 6 x + 6 y + 18 z + s = 128, - 4 x - 4 y + 12 + z = 0$