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I follow PEMDAS, but here are two videos proclaiming PEMDAS wrong:

https://youtu.be/FL6HUdJbJpQ

https://youtu.be/lLCDca6dYpA


I have always added additional brackets/parens to improve understanding, and have been the object of many people's derision because of it.
6/2(1+2) is a bit vague in my opinion, so I would write either 6/(2(1+2)) or (6/2)(1+2). I don't care if you don't like my extra parens, because you can't deny that my intent is explicitly stated and shown.