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)
(x+2)*4/((x+2)*(x+3))-(x+3)*6/((x+3)*(x+2))
⇒ algebra.equations.linear.distr-times(x+2)*4/(x^2+5*x+6)-(x+3)*6/((x+3)*(x+2))