2 xy )- 3y 10 July 8, 2019 16 32 64 128 2 xy 3y 10 4x x y 28 Y 2 xy 12 3y x 10 (- 2xy 2 * 10x 3y 11 8x 10y 4 2x 2 xy 3y 2 10y 8 0 X 2 xy 3y 2 2x 10y 20 2x 2 xy 3y 2 x ay 10