How to undo a Merge and Sync on itunes?

I got a new laptop for my birthday and i home shared all the music from the last laptop to the new one, so i have all the music i want but when i put the iphone in i accidently pressed merge and sync and i'm unable to remove all the music from the last laptop off my phone and put the new music on my new laptop on without it telling me i have not enough memory? How do i erase and sync instead?

YOU CAN't!

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