Cannot delete Mac OSX partition, need help

Hi,
I recently checked my storage space on my 256 GB Macbook Pro and realized that I only have 199 GB of total available space. Checking the Disk Utility, it appears that somehow I ended up with an "Untitled 2" partition that is taking up about 20 GB. This partition is listed as being "free space", but I cannot delete it or otherwise adjust how much space it is taking up. I think the partition might have been created when I installed the public Yosemite beta on a separate partition, however, it seems that I did not delete it correctly or something. How can I restore my hard drive to only having the default "Macintosh HD" and delete the partition to free up space? Thanks so much for any help.

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3. Use Recovery Disk Assistant (RDA) on another Mac running the same major version of OS X as yours to create a bootable USB device. Boot your Mac from the device by holding down the option key at startup.Warning: All existing data on the USB device will be erased when you use RDA.
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hey I really need help please!
I tried to modified my dock using my resources folder in the dock components but I surely did something wrong cause when I tried to click on time machine, it said that I need the right osx version.
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Cannot delete Mac OSX partition, need help

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