X 3 2 2x 2 18 0 July 8, 2019 16 32 64 128 X 3 2x 2 9x 18 0 X 3 2x 2 21x 18 0 X 2 2x 3 2 9 x 2 2x 3 )+ 18 0 + 18 (2)x
