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5x+7x-6y-2y+8z-9z-9z+10
12x-8y-10z+10
follow ya
= 5x - 6y + 8z + 7x-9z - 2y - 9z + 10
= (5x + 7x) + (-6y - 2y) + ( 8z - 9z - 9z) + 10
= 12x - 8y - 10z + 10