7 =- 4 5x 9 July 8, 2019 16 32 64 128 4 (- 7 5x )= 9x 9 4 7 5x 6 4x 9 7 9x 4 )+ 5x 4 5x 2 7 9 1 8 3x 4 9 5x 7 6 4x 5 18 7 x 4 9 5x 6 7 5x 4 6x 5x 9 5x 4 9x 7 4x 3 180 8x 4 5x 7 9 3x 1 x 4 7 9 5x 4 5x 9 )=- 2 x 7 2 7 5x )= 9x 4 9x x 7 5x 4 8 3x 3x 4 )-( 4x 7 )/ 5x 9 2 3