Answer
$(\sqrt[3] 7)^{2}$
Work Step by Step
We know that $a^{\frac{m}{n}}=\sqrt[n] a^{m}=\sqrt[n] (a)^{m}$, where all indicated roots are real numbers.
Therefore, $7^{\frac{2}{3}}=\sqrt[3] (7^{2})=(\sqrt[3] 7)^{2}$.
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