Itunes says synced with another library?

I have bought music on my iphone 4 and want to sync it to the computer in order to burn it to a disc. I also want to take music from my itunes on my computer and sync it to my phone. When i try to sync it an error message comes up saying that it is on another library and the only option is to erase it off of my phone and i don't want to do that. I have never synced my iphone with any other account or computer and they are logged into the same apple id.

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