Exercise algebra.manipulation.rational.simplify

Description
simplify a rational expression (with a variable in a divisor)

Derivation

Final term is not finished

a*(a^2+7*a+12)/(a^2+6*a+9)

⇒ algebra.equations.linear.distr-times

(a^3+7*a^2+12*a)/(a^2+6*a+9)