a = b <--- Set a equal to b
a^2 = ab <--- Multiply each side by a
a^2 - b^2 = ab - b^2 <--- Subtract b^2 from each side
(a + b)(a - b) = b(a - b) <--- Factor each side
a + b = b <--- Each side has (a - b) in common, so divide each side by (a - b)
b + b = b <---Replace the a with b, since a = b
2b = b <--- Combine like terms
2 = 1 <--- Divide each side by b to get 2 = 1
See if you can spot the error made here, noting in which line the error occurs, and what the error is. It took me a while to figure it out when I first saw it in 9th grade, but someone will most likely figure it out pretty quickly.
EDIT:
Zeal sucks at math lolol. He thinks anything divided by zero equals infinity
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crazy shit happens when you divide by zero