Solving an Inverse Function Equation

The linear function $f$ is defined by $f(x) = 3x - 5$ , and its inverse is given by $f^{-1}(x) = \frac{x + 5}{3}$ . What is the value of $x$ for which $f^{-1}(x) = 7$ ?

$7$

$-16$

$21$

$16$

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