1. The problem statement, all variables and given/known data Decide the real value of x making Re(10 / x+4i) = 1 2. Relevant equations I know that you can extend the equation with x-4i. 3. The attempt at a solution But then the equation looks like this: (10x-40i) / (x^2 + 16) = 1 I don't know how to get rid of the -40i to make it in to a real equation. Any help would be valuable!