3 9 7y July 8, 2019 16 32 64 128 5y 9 3 7y 3 y 5 2 9 7y 7y 3 9 71 7 7y * 3 9 870 6y 3 7y 9 3 5x 7y 9 7y 3 9 solve and check 3x 3y 3 7y 9 1x 3 9 - 7 3 7 - 9 3 - 7/9
