Let $u = x^{18}$.
Then, we need to find the differential $du$.
Differentiating $u$ with respect to $x$:
$$ \frac{du}{dx} = \frac{d}{dx}(x^{18}) = 18x^{17} $$
So, $du = 18x^{17} dx$.
Now, we need to express $x^{17} dx$ in terms of $du$.
From $du = 18x^{17} dx$,
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