4 9x 2 7 July 8, 2019 16 32 64 128 9x 4 7x 2 2x 4 9x 2 7 Y 2x 4 9x 2 7 9x 2 7x 4 0 8x 4 9x 2 2x 7 9x 4 2 8 4x )+ 7 7 9x 4 2 3x 8 7 x 4 )+ 9x 2 4 1x 2 9x 7 5 7 98 7 9x 4 2 x 9 7x 1 4 2x 3 )- 7 9x 2 4 9x 7 1 3x 2 9x 4 7x 2 16 9x 4 7x 2 1 (- 6x 2 4 )+( 9x 2 7x
