Can someone please help me figure out the inverse Laplace of:

$\displaystyle

\frac {2x^{2s-1}}{s^3(2s-1)}

$

Well i know what the inverse of

$\displaystyle

\frac {2}{s^3(2s-1)}

$ is but i Dont know what to do with the $\displaystyle x^{2s-1}$

Any guidance would be very appreciated

Thank you