Evaluate the limit:
lim
x
→
9
−
8
x
+
72
x
2
−
16
x
+
63
=
\displaystyle \lim_{{{x}\to{9}}}\frac{{-{8}{x}+{72}}}{{{x}^{{2}}-{16}{x}+{63}}}=
x
→
9
lim
x
2
−
16
x
+
63
−
8
x
+
72
=
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