1 2 x 7 x 21 July 8, 2019 16 32 64 128 21 1 2 x 19 7 8 x 1 7 x 1 )( x 2 )+ 21x 28x 1 2 x 22 7 x 21 1 2 x 7 28 21 1 6 x 2 x 22 7 x 21 1 3 x 2 x 22 7 x 21 7 x 2 )= 4 x 1 )- 21 X 6 2 x 7 1 21 x 7 1 7 x 2
