Unit fraction = \(\frac{1}{x}\) for some positive integer \(x\)

If the fraction \(\dfrac{p-1}{p}\) for a prime \(p\geq5\) can be expressed as two distinct unit fractions \(\dfrac{1}{a}\) and \(\dfrac{1}{b}\). Find \(a+b\).

Enter -69 if you think it cannot be done.

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