2 4 7 9x July 8, 2019 16 32 64 128 2 7 x 4 )+ 9x 5x 1 2 =- 7 4 1 9x 7 9x 4 2 x 9 7x 1 7 9x 4 2 3x 8 7 2 2 4 0 9x 2 (- 3x 7 4 9x 3 2 7 4 5 9x 2 4 x ) 9x 7 6x 3 4 1 2 7 9x 2 7 5x )= 9x 4 8x 7 10x 2 4 9x 1 4 9x 2 4 7 2 9x 4 7 6 5x 3 18