Answer
$g^{-1}(x)=6-x$
Work Step by Step
1. replace g(x) with y
$y=6-x$
2. interchange x and y
$ x=6-y$
3. solve for y
$x+y=6$
$y=6-x$
4. replace y with $g^{-1}(x)$
$g^{-1}(x)=6-x$
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