Evaluate the limit:
lim
x
→
−
1
x
2
−
6
x
−
7
5
x
+
5
=
\displaystyle \lim_{{{x}\to-{1}}}\frac{{{x}^{{2}}-{6}{x}-{7}}}{{{5}{x}+{5}}}=
x
→
−
1
lim
5
x
+
5
x
2
−
6
x
−
7
=
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\displaystyle