If $f(x) = \frac{3x+2}{5}$ what is the value of $\left[f^{-1}(4)\right]^{-1}$?
<|im_start|>system
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<|im_start|>user
If $f(x) = \frac{3x+2}{5}$ what is the value of $\left[f^{-1}(4)\right]^{-1}$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac16
If $f(x) = \frac{3x+2}{5}$ what is the value of $\left[f^{-1}(4)\right]^{-1}$?
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