$\int_0^{\alpha / 3} \frac{f(x)}{f(x)+f\left(\frac{\alpha-3 x}{3}\right)} d x=$

  • A
    $\frac{2 \alpha}{3}$
  • B
    $\frac{\alpha}{2}$
  • C
    $\frac{\alpha}{3}$
  • D
    $\frac{\alpha}{6}$

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