My book is utterly useless - it vaguely gives me a history behind it, its motivations, and then lists an example in which it precedes to write a bunch of(adsbygoogle = window.adsbygoogle || []).push({}); utterly falsestatements and then just.. spits out the answer.

Can someone explain to me what on Earth is going on in the attached picture? If this is not a notational confusion or typos in my book, then I must assert that Euclid's Algorithm makes absolutely no sense. 212 = 106.2, therefore here you go. I demand the author be sent to the lunatic asylum immediately.

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# Can someone explain Euclid's Algorithm to me?

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