Exercise algebra.manipulation.rational.simplify

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

(x+3)*(x+2)*(x+2)*4/((x^2+5*x+6)*(x+3)*(x+2))-(x^2+5*x+6)*(x+3)*6/((x^2+5*x+6)*(x+3)*(x+2))
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