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+7*x+12)/((x+2)*(x+3))
⇒ algebra.equations.quadratic.nice-factors(x+3)*(x+4)/((x+2)*(x+3))
⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (x /= -3)](x+4)/(x+2)