18 - 5 x 3 7 = July 8, 2019 16 32 64 128 18 5 x 3 7 18 5 x 3 1 7x 5 6 7 18 x 3 16 18 3 5 x 75 18 7 x 5 3 2 96 (- 3 x 5 18 x (- 7 7 18 xk 5 x 1 3 14 45 7 1 5 x 18 3 5 x 7 = 35 18 x = 7 2 4 5