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By collecting like terms: 8z+4-2x
-8z + 5z = -3z
8z-5 = 11 add 5 to both sides 8z = 16 divide both sides by 8 z = 2
44
10x + 2y + 8z - 5x + 4z - 4y = 10x - 5x + 2y - 4y + 8z + 4z = (10 - 5)x + (2 - 4)y + (8 + 4)z = 5x - 2y + 12z