3 4x 9 20 July 8, 2019 16 32 64 128 3 4x 20x 9 3 9 4x )+ 4 3x 20 5 3 4x 6 20x 9 4x 3 6x 2 20x 9 2x 1 3 4 x 9 3 x 3 = 9
