The point that confused me was: at school teachers explained that two minuses can never give birth to a plus, so I was just thinking how come the mentioned issue would work.
Your teachers were incorrect, as you have found. Two negatives can yield a positive.
Unless they were talking about adding. Adding two negatives, you will always get a negative. Maybe that's what he's thinking of.
Of course, two wrongs still don't make a right,* but that's another topic entirely. ;)
But three lefts make a right.. right? :)
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