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)
4/(5*x)-2/(3*x)
⇒ algebra.equations.rational.rational-scale12/(15*x)-10/(15*x)
⇒ algebra.equations.rational.rational-plus2/(15*x)