It’s not so much a question of different conventions of order of operations, but that there are certain contrived cases where the order of operations is different. Like PEMDAS doesn’t tell you what to do for 6÷3/10. Also there are different ways of writing out equations (like ignoring the multiplication sign, or using ÷ instead of a superscript/subscript) that sometimes have different rules of orders of operations. So when you mix and match those signs, you give your equation a level of ambiguity that PEMDAS cannot answer.
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