Removing photos from iphone imported through computer?

A while ago I uploaded photos from my computer to my iphone, not through itunes. I've tired everything and i can't figure out how to remove these 200 photos and i'm running out of room on my phone. Help?

Added (1). Also i can't delete the photos directly from my phone and i can't find the photos when i plug my phone into my pc

Just select all the photos and mark them from the bottom left button in photo library and delete them.

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