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I'm pretty sure that's it. I didn't go to my math class this year (long story) so I've pretty much forgotten absolute numbers turn negatives to positives. let's see if it works.
Edit: No. I suck at math. ... It just returned a positive number that wasn't zero.
And well yes, this IS a loop... but uhm. It's quite long and it's really not that important, because I tried it on its own and I still get the error.