Let
f
(
x
)
=
5
−
x
\displaystyle {f{{\left({x}\right)}}}={5}-{x}
f
(
x
)
=
5
−
x
f
−
1
(
x
)
=
\displaystyle {{f}^{{-{1}}}{\left({x}\right)}}=
f
−
1
(
x
)
=
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