Question

(2x-3y+4z)-(x+3y-4z)+(4x-y+9z)+(-2x+3y-z)

Answer 1

2x -3y +4z -x -3y +4z +4x -y +9z -2x +3y -z

(2x-x+4x-2x)+(-3y-3y-y+3y)+(4z+4z+9z-z)

3x - 4y + 16z

Answer 2

=2x-3y+4z-x+3y+4z+4x-y+9z-2x+3y-z
=8z+3x+8z-y-3y
=16z+3x-4y