X 3 7 1 July 8, 2019 16 32 64 128 X 3 7 12 3 x + 7 = 19 X 3 7 10 X 3 7 11 X 3 7 16 X 3 7 15 X /- 3 7 14 X 3 7 13 X 3 7 1 5 8 X 3 7 17 X 3 7 18 X 3 7 1 4 X 7 3 1 3x 2 5 X 3 12 7 2 X 3 10 7 5