How to delete photos off of my iPhone 4 that I put on from my computer?

I don't know how I did it but I managed to put all of the pictures from my computer back onto my phone after importing them off. Now when I go into photos there are thousands of pictures in albums on there that I don't want on my phone since they take up too much storage. How do I put them into my laptop so they don't take up too much space on my phone? Thanks.

Added (1). Also I don't want to delete the pictures I just want them back on my laptop.

You press the delete button.

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