Simplify
x
−
1
⋅
(
y
−
8
⋅
z
7
)
2
x
4
⋅
y
1
⋅
z
−
4
\displaystyle \frac{{{x}^{{-{{1}}}}\cdot{\left({y}^{{-{{8}}}}\cdot{z}^{{7}}\right)}^{{2}}}}{{{x}^{{4}}\cdot{y}^{{1}}\cdot{z}^{{-{{4}}}}}}
x
4
⋅
y
1
⋅
z
−
4
x
−
1
⋅
(
y
−
8
⋅
z
7
)
2
Write your answer with positive exponents only.
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