Equal Sign

I find it interesting how many "math people" abuse the equal sign.

Today I saw a "lesson" that tried to explain how to multiply 3 x 40 like this:

3 x 4 = 12 x 10 = 120

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Hmm, as I was typing that I started to consider an alternate definition of the equal sign that assigns equality, but also evaluates to the value. Still, the above equation needs parens.

(3 x 4 = 12) x 10 = 120