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Se considera expresia E(x)= [tex] (\frac{x+3}{x-4} - \frac{x+1}{x+3} ) * \frac{ x^{2} +4x+3 }{9x+13} [/tex]
a)Aratati ca E(x)= [tex] \frac{x+1}{x-4} [/tex]