Let \(N = \displaystyle \int_{1}^{e^ 8} \ln \left( \dfrac {1}{x} \right) \, dx\). If \(N = -ae^b - c\), where \(a\), \(b\) and \(c\) are positive integers and \(e\) is the base of the natural logarithm, what is the value of \(a + b + c\)?

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