Exercise algebra.manipulation.rational.simplify
Description
simplify a rational expression (with a variable in a divisor)
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
5/(6*a)+3/(7*a)
⇒ algebra.equations.rational.rational-scale35/(42*a)+18/(42*a)
⇒ algebra.equations.rational.rational-plus53/(42*a)