Find an equation of the curve that satisfies
d
y
d
x
=
9
(
21
−
y
)
\displaystyle {\frac{{{\left.{d}{y}\right.}}}{{{\left.{d}{x}\right.}}}}={9}{\left({21}-{y}\right)}
d
x
d
y
=
9
(
21
−
y
)
and y(0) =
6
\displaystyle {6}
6
.
y
(
x
)
=
\displaystyle {y}{\left({x}\right)}=
y
(
x
)
=
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