3y + 4z + 12y = 3y
-3y -3y
-------------------------
4z + 12y = 0
divide everything by 4
z + 3y = 0
-3y -3y
z = -3y
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5x-2y+3z-2x-y-4z=3x-3y-z
9x + 3y + 5z - 5x + 4z - 7y = 4x - 4y + 9z
-8z + 12 = 12 - 4z-8z +4z + 12 = 12 - 4z +4z-4z + 12 -12 = 12 -12-4z / -4 = 0 / -4z = 0:)
6z-4z-z = 6-7-4 z = -5
(z=-3) and (z=7)