7x 13 6x 7 July 8, 2019 16 32 64 128 7x 2 6x 13 7 0 7x 21 3x 13 7 6x 16 Solve 7x 2 6x 13 7 0 Solve 7x 21 3x 13 7 6x 19 13x + 7