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Glitch in the matrix
(ani.social)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
That's exactly where the calculators in the op differ. For more examples, Casio calculators do implicit multiplication first, while ti's treat it the same as explicit multiplication and division. I think that the latter is more predictable personally, but really you just need to know your calculator.
Actually they follow the actual rules of Maths - Terms and The Distributive Law.