Exercise algebra.manipulation.rational.simplify

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

Derivation

4/(x+3)-6/(x+2)

⇒ algebra.equations.rational.rational-scale

(x+2)*4/((x+3)*(x+2))-(x+3)*6/((x+3)*(x+2))

⇒ algebra.equations.rational.rational-plus

((x+2)*4-(x+3)*6)/((x+3)*(x+2))

⇒ algebra.equations.linear.distr-times

(4*x+8-6*x-18)/((x+3)*(x+2))

⇒ algebra.equations.linear.merge

(-2*x-10)/((x+3)*(x+2))