3 9 x 7 2 July 8, 2019 16 32 64 128 3 9 x 7 21 3 9 x 7 1 2 9 3 7 x 4 2 9 3 7 x 5 22 1 3 x 9 )= 2x 7 9 3 4 x 7 1 2 3 1 x )+ 10x 9 x 2 )+ 7 3 9 (- 7 x )= 0 9 9x 21 3 9 2x 7 x 2 3 9 14 x 3 7 23 28 0 9 x 2 7 3 3 x 9 x 27 x =- 7 7 2 3 x 9 46 3 9 x 0 1 x 2 7 3 x 7 )+ 28 9 2 x 5