4x 2 12x 9y July 8, 2019 16 32 64 128 4x 3y 2 12x 9y 6 4x 4 12x 2y 2 9y 4 4x 2 12x 3xy 9y 4x 2 12x 16 9y 2 30y 4x 9y 2 0 12x 5y 38 0