(- 4x 12 7x 5 July 8, 2019 16 32 64 128 4x 5 5 x 12 7x 6 4x 5 7x 3 )- 12 4x 12 2x 5 7x 3 7x 12 2 4x 5 5 4x 1 12 7x 7x 4 12 4x 5 4x 6y 12 7x 5y 4x 1
