Suppose that $f(x)=4x+5$. What is $f^{-1}(f^{-1}(9))$?
Question:
Suppose that $f(x)=4x+5$. What is $f^{-1}(f^{-1}(9))$?
Answer:
Let's think step by step.

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Suppose that $f(x)=4x+5$. What is $f^{-1}(f^{-1}(9))$?
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