No, I didn't ask for the difference in algebra, but you replied as if I did (and btw obviously you didn't have much of a clue either).
What I DID ask for was the difference in quality. Let me save you the trouble of scrolling up to the first post:
"Why is +4 considered better? Are there any situations where you would prefer -10? "
But maybe that wasn't clear enough.
OK, NEVER MIND.
I got a bit upset, because the very idea with the Newbie discussion is to not hesitate to ask "stupid" questions. So I asked a stupid question and I expected to get an informative answer. I have that now, and I'm happy with it. So let's leave it at that.