2 9x 1 7x July 8, 2019 16 32 64 128 9x 2 7x 1 0 9x 1 7x 2 17 7 7x 3 2 9x 1 )+ 6 2x2 9x 2 )+( 3x2 7x 1 2x 9x 2 )+( 3x 7x 1 2x 9 2x 7
