APFIVE 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 $$f^{-1}(x) = 7$$?
A
$$16$$
B
$$-16$$
C
$$7$$
D
$$21$$
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