8x 5 12x 7 July 8, 2019 16 32 64 128 5 8x 7 12x 5 6x 1 4 8x 7y 5 12x 13y =- 8 7 8x 5 12x 3 =- 10 12x 5 =- 8x 7 4x 12x − (5x − 8) = 8 + 7x