If $f(x)=g(g(x))-g(x)$ and $g(x)=2x-1$, find $f(3)$.
Question:
If $f(x)=g(g(x))-g(x)$ and $g(x)=2x-1$, find $f(3)$.
Answer:
Let's think step by step.

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If $f(x)=g(g(x))-g(x)$ and $g(x)=2x-1$, find $f(3)$.
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