Finite Math Examples

$x - 14 y + z - 2 w = 1$ , $7 x + 7 y + z + 3 w = 2$ , $8 x - 7 y + 2 z + w = 3$

Step 1

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$x - 14 y + z - 2 w = 1, 7 x + 7 y + z + 3 w = 2, 8 x - 7 y + 2 z + w = 3$