$$(343a^{-9}b^{3})^{2/3}$$
$\frac{49b^{2}}{a^{6}}$
$$343^{\frac{2}{3}}\left(a^{-9}\right)^{\frac{2}{3}}\left(b^{3}\right)^{\frac{2}{3}}$$
$$343^{\frac{2}{3}}a^{-6}\left(b^{3}\right)^{\frac{2}{3}}$$
$$343^{\frac{2}{3}}a^{-6}b^{2}$$
$$49a^{-6}b^{2}$$
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$-\frac{294b^{2}}{a^{7}}$
