Can't remove partitions

[Luc4]

Hi! I recently created some partitions to install Linux, but now I don't need it anymore so I would like to assign the space to my mac os partition again. I used bootcamp to create that partition and then the Linux partitioner to create the swap partition. The problem is that now bootcamp is not able to remove the partition and disk utility stuck preparing to remove the partitions. I read in the forums disk utility should be able to remove them, but it seems it does nothing. As soon as it starts the CPU goes to 2% and nothing happens. I tried letting it work all night long and nothing changed. Any idea how I can remove those partitions and assign them back to mac os?
Thanks!