Just go buy a new hard drive and trash the other 2 or sell it
...
Lack of creativity, buying a new hard drive is not a very practical solution.
Maksim, due to lack of people participating in the small Apple area of our forum, you might try the IRC chat:
Server: irc.freenode.net
Channel: #apple
Channel: #mac
Channel: #macintosh
You may loose the data on one partition, since one will have to be deleted. Back it up before deleting the extra, and merging the non-allocated space into the main partition