Thanks to Lucas from Brazil who sent this problem! This is a proof that 3 = 0 using sneaky algebra that I had never seen before (this is a sneaky mistake, not a simple divide by 0 fallacy). Every step seems correct, but the conclusion is clearly false. Can you find the mistake?

My blog post for this video
https://wp.me/p6aMk-7Vf

Sources
link to book from Brazil: http://www.obmep.org.br/bq/bq2009.pdf (page 34, problem 13)
http://mathforum.org/library/drmath/v...

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