Exercise algebra.manipulation.rational.simplify
Description
simplify a rational expression (with a variable in a divisor)
Derivation
Final term is not finished
(x-1)*(x+4)/(x^2*(x-6)+5*x)
⇒ algebra.equations.linear.distr-times(x^2+3*x-4)/(x^2*(x-6)+5*x)