3 7 x 1 21 July 8, 2019 16 32 64 128 5 x 3 )- 7 3 1 x )+ 21 3 7 1 21 x 14 1 6 2 3 x 1 21 2 7 3 x 7 2 1 3x 7 21 3 5 x 1 21 x 7 8 3 5x 2 3x x 1 7 =- 5 21 1 3 x 7 x 14 x 21
