1. The problem statement, all variables and given/known data example problem: 5 = [(x)(4+x)] / (4-x) answer: 5 2. Relevant equations Unsure what to use. 3. The attempt at a solution Not sure what my professor did, but I thought that if i multiply by the reciprocal of something, I have to balance by multiplying the other side as well. It seems like everything just cancelled out and the only thing left was x = 5. I would just like to know what algebraic property or technique can be used to find x BESIDES quadratic formula.