How to solve integral $\int_0^t\frac {e^{-\frac{s}{c}}} {a(t-s)+b} ds$

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I'm currently trying to solve the following integral, so if anyone could please help me, I would be really grateful.

The integral is as follows:

$$\int_0^t\frac {e^{-\frac{s}{c}}} {a(t-s)+b} ds,$$

where $a$, $b$ and $c$ are constants.

Thank you