Find the first derivative of
f
(
x
)
=
9
x
−
3
21
−
x
\displaystyle {f{{\left({x}\right)}}}=\frac{{{9}{x}-{3}}}{{{21}-{x}}}
f
(
x
)
=
21
−
x
9
x
−
3
.
f
′
(
x
)
=
\displaystyle {f}'{\left({x}\right)}=
f
′
(
x
)
=
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