Exercise algebra.manipulation.rational.simplify

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

Derivation

7/(4*a)+3/(4*b)

⇒ algebra.equations.rational.rational-scale

7*b/(4*a*b)+3*a/(4*a*b)

⇒ algebra.equations.rational.rational-plus

(7*b+3*a)/(4*a*b)