1 / 3 - x + 1 / 6 = 3 / 18- x = 3 / 18 - 1 / 6 - 1 / 3- x = 3 / 18 - 3 / 18 - 6 / 18- x = - 6 / 18x = 6 / 18x = 1 / 3（1 - x）/ 3 + 1 / 6 = 3 / 18两边乘以 18 得：6（1 - x）+ 3 = 36（1 - x）= 01 - x = ...