Computer uploaded old photos into iphone6s, how do I delete?

I

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I use iTunes to upload my photos from my iphone6s to my windows pc. Well last time I plugged it in everything seemed the same except it somehow added about 200 old photos from my computer back onto my phone, but I can't delete them using my phone gallery. And I can't figure out how to do it thru my computer either. It's taking up a lot of memory. Please help.
 

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