Exercise algebra.manipulation.rational.simplify

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

Derivation

1/(x+5)-3/(x-4)

⇒ algebra.equations.rational.rational-scale

(x-4)/((x+5)*(x-4))-(x+5)*3/((x+5)*(x-4))

⇒ algebra.equations.rational.rational-plus

(x-4-(x+5)*3)/((x+5)*(x-4))

⇒ algebra.equations.linear.distr-times

(x-4-3*x-15)/((x+5)*(x-4))

⇒ algebra.equations.linear.merge

(-2*x-19)/((x+5)*(x-4))