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6x + 5 + (-3x - 6)
6x - 3x + 5 - 6
3x - 1
b
6x - 5y - 2z + (-8x + 6y + 9z)
6x - 8x - 5y + 6y - 2z + 9z
-2x + y + 7z
6x+5-3x-6
6x-3x+5-6
3x-1
b. 6x-5y-2z+(-8x+6y+9z)
6x-5y-2z-8x+6y+9z
6x-8x-5y+6y-2z+9z
-2x+y+7z