Add 4z to each side: 19 = -z so z = -19
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6z-4z-z = 6-7-4 z = -5
(z=-3) and (z=7)
(z - 9)(z + 5)
3y + 4z + 12y = 3y -3y -3y ------------------------- 4z + 12y = 0 divide everything by 4 z + 3y = 0 -3y -3y z = -3y
5x-2y+3z-2x-y-4z=3x-3y-z