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Originally posted by simmnfierzig
Never heard that, but that seems really stupid. There is no point in ordering multiplication / division and addition / subtraction seperately
Doesn't matter if you multiply or divide first 
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It looks like a worldwide thing, with different regions having different acronyms but all having the same meaning, hence why everyone is getting 9.
It probably has something to do with complexity of one set vs. the other. Plus, without PEMDAS/BEMDAS/BOMDAS, we would get a slew of different answers. It's just a set rule, like most mathematical problems.