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Function Equal to Its Inverse

Mark

Let the function $f$ be defined by $f(x)=\frac{x+2}{3x-4}.$ Find all values of $x$ for which $f^{-1}(x)=f(x)$.

A

$x = 2$

B

$x = 2 \text{ and } x = -\frac{1}{3}$

C

$x = \frac{1}{3}$

D

$x = -\frac{1}{3}$

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