X 7 5 3 7 4 1 July 8, 2019 16 32 64 128 (- 4 x 7 5 x (- 3 4 7 15 3 7 1 4 x 5 3 7 4x 5 x 7 = 35 - 5(7 - x) - 4(x - 8) = 3
