Exercise algebra.manipulation.rational.simplify

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

Derivation

2*a-1/(3*a)

⇒ algebra.equations.rational.to-rational

6*a^2/(3*a)-1/(3*a)

⇒ algebra.equations.rational.rational-plus

(6*a^2-1)/(3*a)