PEMDAS

Please excuse my dear Aunt Sally, for she knows not what she does
She orders around the operations, from left to right just because
Please comes first, as it always should
Excuse is next, if you would
My dear can be dear my, Aunt Sally can be Sally Aunt
But never Aunt Sally before my dear, no you really can't
Follow her rules and you won't be mistaken for a jester or a fool
It's a simple problem really when you use the PEMDAS tool
So please excuse my dear Aunt Sally, or dear my Sally Aunt, if you must
And never go wrong, at least not in math, when in the rules you trust