Question 778404
(2x+3y+z-7)+(4x-2y-z+8)+(-3x+y-2z-4)


2x+3y+z-7+4x-2y-z+8-3x+y-2z-4


(2x+4x-3x)+(3y-2y+y)+(z-z-2z)+(-7+8-4)


(3x)+(2y)+(-2z)+(-3)


3x + 2y - 2z - 3