Delete iPhone Photo Library folder?

So I have a small problem. You see, I wanted to sync photos from my old iPod Touch onto my new iPhone 4S. But by doing so, I now have two un-deletable folders in my Photos- Photo Library and the folder that I wanted to sync. Both have the exact same pictures, and have duplicates. But I can't delete either the folders nor the pictures!
I was just wondering if there's any way of deleting one of the folders/ the pictures, because I want those photos on my iPhone, but I now have over 2, 000 photos when originally I had about 500.

Have you ever tried to delete them via iTunes?

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