Exercise algebra.manipulation.rational.simplify

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

Derivation

(x^2-7*x+12)/(x^2+x-20)

⇒ algebra.equations.quadratic.nice-factors

(x^2-7*x+12)/((x-4)*(x+5))

⇒ algebra.equations.quadratic.nice-factors

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

⇒ algebra.equations.rational.cancel-div, clipboard=[condition == (x /= 4)]

(x-3)/(x+5)