If $\frac{\sqrt{3+x}+\sqrt{3-x}}{\sqrt{3+x}-\sqrt{3-x}}=2,$ then $x$ is equal to

  • A
    $\frac{5}{12}$
  • B
    $\frac{12}{5}$
  • C
    $\frac{5}{7}$
  • D
    $\frac{7}{5}$

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