20 7 x 3 ) 4 2 July 8, 2019 16 32 64 128 20 7 x 3 )+ 4 2 20 - 7x x 3 )+ 4 = 2 20 7 2 x 2 3 4 5 7 16 20 x 2 3 4 4 7 20 x 6 2 3 4 x 7 20 5x 3 2x
