2x + 3x + 4x
(-x + 2) + 3x
(16x +4) +(10x - 2)
(8x +17y) + (11x -8y)
55x +65y+75
(2x + 5) + (3y +2)
(3y +2) + (4y +2)
(x + 1) +(3y +2)+(4y+2)
5x-2x+2y-3
6x-2x-7-5