A divisive math problem has gone viral because netizens simply cannot agree on the correct answer. The equation hails from the 1950s and is baffling many people for a fascinating reason: it appears that over the years, the “rules” for how to solve it have changed.

**The math problem is this:**

**9 – 9 ÷ 9 + 9 – 9 ÷ 9 = ?**

Can you work it out? Give it a try, and once you think you have the right answer, scroll down to see what all the controversy is about and what the correct answer is.

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**Here is the answer:**

9 – (9 ÷ 9) + 9 – (9 ÷ 9) = ?

9 – (1) + 9 – (1) = ?

Then we move on to solve addition and subtraction from left to right as follows:

(9 – 1) + 9 – 1 = ?

(8 + 9) – 1 = ?

17 – 1 = 16

Is this the same answer that you arrived at? If so, congratulations! Not everyone is able to solve it