Which of the following equation is e q u i v a l e n t to 4x + 6 = 1 8 1 + 3x + 2 = 1 b 5x + 2 - x = 1C 18 + 6x - 2 - 2x = 1D 9x - 5x - 1 - 1 1 = 1

C. 18 + 6x - 2 - 2x = 1