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by bsder 153 days ago
(F + 40) * 5/9 - 40 = C

(C + 40) * 9/5 - 40 = F

Takes advantage of the fact that -40 F and -40 C are the same.

Remember it as (move origin -- convert -- move origin back).

I find it easier as a I don't have to remember precedence rules and the multiplication is obvious.