Exercise algebra.manipulation.rational.simplify

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

(x^2-2*x-3)*(x+1)*7/((x-3)*(x+1)*(x^2-2*x-3))-(x-3)*(x+1)*(x-3)*2/((x-3)*(x+1)*(x^2-2*x-3))

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