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5x + 7x - 6y - 2y + 8z - 9z - 9z + 10
= 12x - 8y - 10z + 10
=5x-6y +8z+7x-9z-2y-9z+10
=5x+7x-6y-2y+8z-9z-9z+10
=12x-8y-10z+10
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