A limit

Calculus Level 3

\[\large \lim_{x\to-1} \dfrac{ \ln[(x+5)^2 - 15] }{x^3 + 1 } \]

If the value of the limit above is the form of \( \dfrac ab\), where \(a\) and \(b\) are coprime positive integers, find \(a+b\).

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