Question: - 7 x + 9 y - 2 z = - 8 7 y + 3 z = - 2 0 7 x - 2

-7x+9y-2z=-8
7y+3z=-20
7x-2y+4z=-3
-7x+9y-2z=-8 7y+3z=-20 7x-2y+4z=-3

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