1 answer
(click or scroll down)
Equivalent:
2x + 2y +2x = 4x + 4y - y
2x + 6 + x + 3 = Y + 3x - y + 9
2x + 2y + (2x + y) = 7x + x + 0 - y
5(2x) - 2x = 2x - x + 7x