X 7 4 2 9 1 7 July 8, 2019 16 32 64 128 7 9x 4 2 x 9 7x 1 4 1 x 2 9 x 7 5 7 98 (x - 7 4) + 2 8 = 9 1 (x - 7)/9 = (4 - x)/7
