Use algebra to find the inverse of the function
f
(
x
)
=
x
−
20
\displaystyle {f{{\left({x}\right)}}}={x}-{20}
f
(
x
)
=
x
−
20
.
The inverse function is
f
−
1
(
x
)
=
\displaystyle {{f}^{{-{1}}}{\left({x}\right)}}=
f
−
1
(
x
)
=
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