calculating Laplace Transform

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I know what the Laplace Transform of a function

$\exp(-x(t))$

is, where $x(t)$ is positive for all $t$. Is there any way to calculate what the Laplace Transform of

$\frac{1}{1-\exp(-x(t))}$

is?

I have tried with the geometrical series, but then I still do not know how to calculate the Laplace Transform of

$\exp(-kx(t))$,

which occurs in the formula (for $k=2,3,...$). One can assume that the function $x(t)$ is "enough nice" if this is needed (i.e. differentiable, continuous or what is necessary).