9x 4y 5 0 July 8, 2019 16 32 64 128 9x 2 4y 2 4y 12x 5 0 6xy 9x 4y 5 0 9x 2 6x 4y 2 8y 5 0 6xy - 4y + 6 - 9x 9x-4 5
