Answer
$\dfrac{2y^{5/7}}{3}$
Work Step by Step
Since $x^{-a}=\dfrac{1}{x^a}$, then,
\begin{align*}
\dfrac{2}{3y^{-5/7}}
\\\\=
\dfrac{2y^{5/7}}{3}
.\end{align*}
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