Find the solution for: [(1+cx)^1/3 - 1]/x as x approaches 0.

Hello, I've been trying to solve this problem for a little over a month without much progress..

Looking at it, the logical answer seems to be to get the (1+cx) out of it's third root form to cancel the constants and remove x, but I can't seem to do that w/o adding other similar terms. I've tried adding elements to the top to get a factorial out but that hasn't worked, I've tried multiplying by the positive counterpart ((1+cx)^1/3 + 1) to up the polynomial without luck, and lately I've been playing with natural logs to bring the 1/3 down; all to no avail.

I know the limit exists for sure, any help would be appreciated.

Thanks,

Rhek