Find all critical values for
f
(
x
)
=
7
x
−
8
9
x
2
+
9
x
+
6
\displaystyle {f{{\left({x}\right)}}}=\frac{{{7}{x}-{8}}}{{{9}{x}^{{2}}+{9}{x}+{6}}}
f
(
x
)
=
9
x
2
+
9
x
+
6
7
x
−
8
.
The critical values occur at x =
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