Выполните действие \(\frac{5+13x-6x^2}{9x^2+6x+1}+\frac{2x}{3x+1}\) . \(\)
\(\frac{5}{3x+1}\)
\(\frac{-6x^2+15x+5}{(3x+1)^2}\)
\(\frac{27x+18}{2x+20}\)
\(\frac{-6x^2+15x+5}{27x^3+27x^2+9x+1}\)