1. The problem statement, all variables and given/known data 1/x - 1/a = 1/b Solve for x 2. Relevant equations 3. The attempt at a solution I used to be able to do this in high school, but now I am 43! Normally, I would just cross-multiply and solve for x, to get the x out of the denominator, but you cannot cross-multiply if there is more than one numerator! Does anyone know how to solve this? Thanks!