How to delete hidden partition on my Mac?

Well, I tried to install Windows 7 with BootCamp but I thought it was taking too long to partition my Hard Drive, so I cancelled half way. Now I can't manage to find a way to get my 40GB back. And My Hard drive appears to be "not partitioned" in Disk Utility where I tried to delete the unwanted partition of the Hard Drive. I would love somebody to help me delete that thing because Im running out of disk space and I have some important stuff on my Mac. Please help

Cmd (the key with the Apple logo) and the R key (but lower case.) Also, might try just restoring from a Time Machine or clone backup, from prior to what you did, if you have one.
See
http://www.dummies.com/how-to/content/when-to-run-first-aid-in-mountain-lions-di sk-utili.html

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