Answer
$\sqrt[5] (2x)^{3}$
Work Step by Step
We know that $a^{\frac{m}{n}}=\sqrt[n] (a^{m})$ (where m and n are positive integers greater than 1 with $\frac{m}{n}$ in simplest form and $\sqrt[n] a$ is a real number).
Therefore, $(2x)^{\frac{3}{5}}=\sqrt[5] (2x)^{3}$.