1. The problem statement, all variables and given/known data 2. Relevant equations g = (Gm)/r2 3. The attempt at a solution I tried doing (Gm1)/a2 = (Gm2)/(r-a)2 where a is equal to the distance from the position we're trying to find to the center of the most massive object but end up getting a quadratic in the denominator on the right side. The answer in the back of the textbook is this: Thank you!