Khan/khan-exercises — pull request #55243 by petercollingridge (2013-07-22 16:41:03+00:00)
Title: Solving rational expressions 2

Solving for a variable given an expression, A = B + C, where A, B and C are rational expressions with the same denominator or a simple ratio of a common denominator.
![solving rational expressions 2](https://f.cloud.github.com/assets/219302/836314/7ba94c38-f2ed-11e2-8e22-bae41d31a837.png)