7 4x 9 =- 6 July 8, 2019 16 32 64 128 7 4x 9 6x 4x 9 5 2x 7 )- 6x 7 4x 9 7 x 6 7 4x 9 )=- 26 6x 7 4x 1 9 6x 7 9 4x 2 6x 12 7 =- 9 4x 6 3 4x 2x 5 3x 7 4x 9 ) = 66 7 6x 4 9 4x 6 6x 18 7 4x 9 10 4x 7 9 3x 6 20 4x 9 6 x 2x 7 2 4x 9 10 6x )- 7 7 2x 6 3 4x 9 2 4x 9 7 6 )+ x 1 x 3