How come we have to follow PEMDAS in math?

Why do we follow PEMDAS when doing math problems? I mean, cant we try doing the problems on our own? or:Why do we follow PEMDAS when doing math proble

Why do we follow PEMDAS when doing math problems? I mean, can't we try doing the problems on our own?

or:Why do we follow PEMDAS when doing math problems? I mean, can't we try doing the problems on our own?

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