If $f(x) = \frac{1}{x^2} \int_3^x (2t - 3f'(t)) dt$,then $f'(3)$ is equal to

  • A
    $\frac{-1}{2}$
  • B
    $\frac{-1}{3}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{1}{3}$

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