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)
9/(5*a)-1/(2*a)
⇒ algebra.equations.rational.rational-scale18/(10*a)-5/(10*a)
⇒ algebra.equations.rational.rational-plus13/(10*a)