(3x-5y-8z)-(2x+7y-3z)+(5z-11x+y)
(3x-5y-8z)-(2x+7y-3z)+(5z-11x+y) = 3x-5y-8z-2x-7y+3z+5z-11x+y = -10x-11y+0 = -10x-11y+0