Controversial addition, subtraction and division problem with six 9s

Recently, a math problem has been circulating online; at first glance, it seems simple, but it has sparked debate about the answer.

The question is as follows: Use your intelligence to solve the following math problem: 9 - 9 : 9 + 9 - 9 : 9 = ?.

The problem is simple, yet it's causing controversy.

At first glance, many people would think this problem is extremely simple, but the calculation results in an incorrect answer. Remember the rules of multiplication, division, addition, and subtraction to successfully solve this problem.

Solving this problem correctly definitely requires a high IQ and excellent mathematical skills. Scroll down to the comments section and leave your answer.

Source: https://vtcnews.vn/bai-toan-cong-tru-chia-sau-so-9-gay-tranh-cai-ar885884.html