Simplify the expression. If a variable has an exponent, it should be positive. Do not use any parentheses in your answer.
(
n
3
z
4
)
−
2
\displaystyle {\left(\frac{{n}^{{3}}}{{z}^{{4}}}\right)}^{{-{{2}}}}
(
z
4
n
3
)
−
2
=
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\displaystyle