Yep May Jesus save us students from the evil of how do you add negative fractions?. I used to face same problems that you do when I was there. I always used to be confused in Pre Algebra, Algebra 2 and Algebra 2. I was worst in how do you add negative fractions? till I came to know of Algebra Buster. It is really usefuland I would truly recommend it. The best part of the software is that it will also help you learn algebra and not just give your answers. I found Algebra Buster effective and am sure it will help you too. Enjoy!
Algebra Buster is a very remarkable product and is surely worth a try. You will find many exciting stuff there. I use it as reference software for my math problems and can say that it has made learning math much more fun.