Exercise algebra.manipulation.rational.simplify

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

Derivation

6/(x-1)-3/(x-2)

⇒ algebra.equations.rational.rational-scale

(x-2)*6/((x-1)*(x-2))-(x-1)*3/((x-1)*(x-2))

⇒ algebra.equations.rational.rational-plus

((x-2)*6-(x-1)*3)/((x-1)*(x-2))

⇒ algebra.equations.linear.distr-times

(6*x-12-3*x+3)/((x-1)*(x-2))

⇒ algebra.equations.linear.merge

(3*x-9)/((x-1)*(x-2))