[raybbr]

You’re equation is correct. Odd that others can’t see it.

[RipSawyer]

“You’re equation is correct. Odd that others can’t see it.”
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Your first word is wrong.

[polymuser]

Yep. Math order of operation rules have obviously not been taught well for many years.

It’s also evidenced by the little math challenge posts on Facebook and the majority of wrong answers.

13-3-1 = 13 + (-3) + (-1) = (13-3) -1 = 13-(3+1) = 9

That sign in the last equality above throws a lot of people.