2 5x 7 8 July 8, 2019 16 32 64 128 2 5x 7 )+ 8x 2 5x 8 7 5 x 5x 2 8x 7 0 2 5x 7 2 3x 8 2 (- 5x 7 )=- 6 x 8 2 5x 20 )-( 15 8x )= 7 6x 2 7 5x 7 8 4 5x 2 7 9 1 8 5x 7 2 17x 2 84x 46 3 x 2 )-( 5x 7 )= 8 5x 2 5x 7 )( 8x 6 2 5x 7 2x 8 2 3 5x 7 )= 8x 5x 2 8x 7 2x 3x 2 7 5x 8 4 11 4