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Ill say. If I follow GPs life-hack for 30C I get 60F, which is significantly different from 86F. Some life-hack.

30*2 + 30 = 90, which is pretty close to 86.

Going the other way

86-30 / 2 = 28 which is close to 30.

I was referring to the comment above that one.

That's why they called it a "shitty" life hack.