A seemingly easy math problem has gone viral across social media after countless people confidently gave the wrong answer within seconds. The puzzle looks simple at first glance:

7 – 2(8 – 4)

Yet despite involving only basic arithmetic, the equation triggered heated debates online, with many users insisting the answer should be:

• 6,
• 15,
• or even 1.

But according to the standard order of mathematical operations, the correct answer is actually:

-1

So why are so many people getting confused?

The biggest mistake comes from ignoring the proper calculation sequence known as:

PEMDAS

(or BODMAS in some countries), which stands for:

• Parentheses,
• Exponents,
• Multiplication and Division,
• Addition and Subtraction.

Mathematicians explain that operations inside parentheses must always be solved first before continuing with multiplication or subtraction.

In this equation:

7 – 2(8 – 4)

the first step is solving what is inside the brackets:

8 – 4 = 4

The equation then becomes:

7 – 2(4)

Next, multiplication must happen before subtraction:

2 × 4 = 8

Now the equation is:

7 – 8

which gives the final answer:

-1

Experts say many people incorrectly answer “6” because they subconsciously calculate:

7 – 2 = 5

before continuing the rest of the equation, completely skipping the required multiplication step.

Psychologists explain that viral math puzzles like this spread quickly because they create:

• instant confidence,
• quick emotional reactions,
• and competitive debates in comment sections.

Interestingly, many people continue defending incorrect answers even after seeing the explanation, which researchers say reflects how strongly the brain trusts its first impression.

Teachers online also pointed out that social media math puzzles often reveal how many adults:

remember formulas from school only partially.

Despite the arguments, mathematicians agree there is no controversy in this case:

if standard order-of-operations rules are followed correctly, the answer is unquestionably -1.