7x 10 5x 10 July 8, 2019 16 32 64 128 7x 10 5x 10 9 7 7x 10 5x 6 6x 10 (- 7x 2 5x 10 10x 3 5x 9y =- 10 7x 10y =- 1 10 5x =- 10x 2 1 7x 5x 10 7x x 10 x 7 x 10