Simplify the expression completely (Make sure no negative exponents are included.):
(
2
z
−
8
)
(
9
z
7
)
\displaystyle {\left({2}{z}^{{-{{8}}}}\right)}{\left({9}{z}^{{7}}\right)}
(
2
z
−
8
)
(
9
z
7
)
=
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