5 12 4 1 7 July 8, 2019 16 32 64 128 12 1 4 x 5 3 7 12 5 x 1 75x2 1 4 7y 12 1 4 2y 5 3 5 4m 2 m 12 7 4 1 2m 5 1 4 divided by 7 12 (- 7 12 5 6x 1 4 1 3x