The Viral Math Trap That’s Fooling Thousands — Can You Solve It?

A simple-looking math equation has been causing surprisingly heated debates online.

At first glance, it seems like something you could solve in just a few seconds:

7 − 2(8 − 4)

But depending on how quickly you read it, you might arrive at a completely different answer from someone else.

Some people say 6. Others argue for 20. And some say the answer is −1.

So which one is actually correct?

The Answer Is −1

The key isn’t complicated mathematics. It’s knowing the order of operations.

Let’s solve the expression carefully.

Start with:

8 − 4 = 4

The equation becomes:

7 − 2(4)

The expression 2(4) means:

2 × 4 = 8

Now we have:

7 − 8

Finally:

7 − 8 = −1

So the complete solution is:

7 − 2(8 − 4) = −1

The confusion usually comes from doing the subtraction too early.

Someone might look at the first part and calculate:

7 − 2 = 5

Then continue from there and arrive at another number.

But multiplication has priority over subtraction. Once the parentheses have been solved, 2 × 4 must be calculated before subtracting it from 7.

This is the basic principle behind PEMDAS, commonly taught as:

Multiplication and division are handled before addition and subtraction when they appear at the same level of the expression.