People seriously still fall for that? palm
Wow, I knew it was false and incorrect when I was 10 years old and learning algebra.
I know people have already said it, but to believe that requires some serious math fail. Plug in any random number for a and b and you'll see that. If they're the same, then (a-b) must be zero. That's...not even algebra. That's basic arithmetic.
Yeah. This is easy. Now, here's a tougher one. This one was presented as a challenge in a calculus class I took once. See if you can find the flaw...