X 7 2x 9 4 3 July 8, 2019 16 32 64 128 7 x 1 4 2x 9 3 2x 9 4 x 7 12 x 3 4 2x 7 2 9 x 3 2 0 2x 9 5 x 4 3 2x 7 2x 7 9 - 2 x - 4 x + 7 = 7
