Let $u = z^9 + 5$.
Then, we need to find the differential $du$.
Differentiating $u$ with respect to $z$:
$$ \frac{du}{dz} = \frac{d}{dz}(z^9 + 5) = 9z^8 $$
So, $du = 9z^8 dz$.
Now, we need to express $z^8 dz$ in terms of $du$.
From $du = 9z^8 dz$, we can write
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