Find the inverse of the function:
f
(
x
)
=
\displaystyle {f{{\left({x}\right)}}}=
f
(
x
)
=
9
x
+
3
\displaystyle {9}^{{x}}+{3}
9
x
+
3
f
(
x
)
−
1
\displaystyle {f{{\left({x}\right)}}}^{{-{1}}}
f
(
x
)
−
1
=
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