if its the lens - trash it. If not, open the camera up & take a look around inside. if the scratch is in the same place on your negs, place a film strip across the film plane and see if you can see any tiny little burrs, etc in the general area f the scrsatch. if so, get a realllllllllll fine emery board and try to clean it off. Then, get out the can of compressed air & blow the heck out of the body.

Run a test roll. If it's still there, make a lightweight boat anchor out of it and buy a new one.

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But then what do I know, I am but a mere caveman