If $x=\dfrac{2\sqrt{15}}{\sqrt{3}+\sqrt{5}}$,then what is the value of $ \dfrac{x+\sqrt{5}}{x-\sqrt{5}}+\dfrac{x+\sqrt{3}}{x-\sqrt{3}}$ ?
$ \sqrt{5}$
$\sqrt{3}$
$\sqrt{15}$
2
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