After tons of tries with the command line trying to auto straighten, I had to give up. I could not find a way to cut out the black areas from the center of the book, since after the split from double page scans, the black area is alternating side throughout the document.
I tried some other options for cleaning up but the pages ended up with slightly different sizes and I couldn't figure out how to keep page sizes.
Would be fun to get it 100% right cosmetically but it is perfectly readable now.
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