21 4 x 5 2 July 8, 2019 16 32 64 128 21 4x 5 2x 21 5 3 x 4 2 3 /= 6 2x 21 4 x 5 1 4 - 5 x 2 ) = 21 3 x 4 )- 21 7 5 x )+ 21x 28 4 5 x 21 1 2 x 4 5 )= 21 10 21 1 2 x 5 3 4 21 x 4 21 x 5
