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)