Simplify the expression
(
343
a
−
7
/
2
)
−
2
/
3
a
2
/
9
\displaystyle \frac{{\left({343}{a}^{{-{7}/{2}}}\right)}^{{-{2}/{3}}}}{{a}^{{{2}/{9}}}}
a
2
/
9
(
343
a
−
7
/
2
)
−
2
/
3
. Write your answer in rational exponent form,using nonnegative exponents.
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