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-4)*(x+3)/((x-1)*(x-4))+(x-1)*(x+2)/((x-1)*(x-4))
⇒ algebra.equations.linear.distr-times(x-4)*(x+3)/((x-1)*(x-4))+(x-1)*(x+2)/(x^2-5*x+4)