Now, we need to find $\int f(f(x)) dx$ and $\int 5f(x) dx$.
For $\int f(f(x)) dx$, we don't have enough information to find the exact value.
However, for $\int 5f(x) dx$, we can use the property of integrals that states:
$\int kf(x) dx = k\int f(x) dx$,
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