One short math problem set the internet ablaze this weekend—and incited charged arguments on math teacher Twitter, too.

A tweet has gone viral with users debating in the comments over the math used to solve a basic algebra question.

To help students in the United States remember this order of operations, teachers drill the acronym PEMDAS into them: parentheses, exponents, multiplication, division, addition, subtraction.

Viral math equations have been known to divide people on the internet. Some problems are so mind-bogglingly hard that they seem impossible, even if they're meant for elementary school students.