Let \(f(x) + 5f\left(\dfrac{1}{1-x}\right) = \dfrac{1}{x}\) for for all real \(x\in \mathbb R \backslash \{ 0,1\} \). If \(f(5) = \dfrac ab\), where \(a\) and \(b\) are coprime positive integers, find \(a+b\).

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