Exercise algebra.manipulation.rational.simplify

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

(x^2-5*x+4)*(x-4)*(x+3)/((x-1)*(x-4)*(x^2-5*x+4))+(x-1)*(x-4)*(x-1)*(x+2)/((x-1)*(x-4)*(x^2-5*x+4))
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