Let $f(x)=x+3$ and $g(x)=3x+5$.  Find $f(g(4))-g(f(4))$.
Question:
Let $f(x)=x+3$ and $g(x)=3x+5$.  Find $f(g(4))-g(f(4))$.
Answer:
Let's think step by step.

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Let $f(x)=x+3$ and $g(x)=3x+5$.  Find $f(g(4))-g(f(4))$.
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