How about some more details on your problem with common denominator calculator? I might be able to suggest. If you are not able to get a good assistance or some one to sit and sort out your trouble or if it is not affordable, then there might be another solution to your problem. There are some good algebra software that you can check out. I tested them out myself. It came across to me as excellent as any tutor can be. I would select Algebra Buster for the kind of answer that you are looking out for. What is attractive about it is that it assists you one step at a time to the answer rather than just giving the answer. Why not give it a try?
point-slope, least common measure and rational equations were a nightmare for me until I found Algebra Buster, which is really the best algebra program that I have come across. I have used it frequently through several algebra classes – Basic Math, Basic Math and Algebra 1. Just typing in the math problem and clicking on Solve, Algebra Buster generates step-by-step solution to the problem, and my math homework would be ready. I truly recommend the program.