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k, I'll have it up in a minute :)

what did they do wrong? I can't figure it out!

you cannot divide by zero

so dividing both sides by (x-x) is not a valid operation in mathematics

it's divided by zero... but even though (x-x)=0, it's not exactly dividing by zero... I thought :P

it IS dividing b zero.
otherwise you could prove any relation, e.g.:\[6*0=19*0\]\[\therefore 6=19\]

:-) good luck on your quest!