Exercise algebra.manipulation.rational.simplify
Description
simplify a rational expression (with a variable in a divisor)
Derivation
3/(x^2*y)-5/(2*x*y)
⇒ algebra.equations.rational.rational-scale6/(2*x^2*y)-5*x/(2*x^2*y)
⇒ algebra.equations.rational.rational-plus(6-5*x)/(2*x^2*y)