This puzzle has gone especially viral because it left many users confused. It was posted on the social network TikTok on an account that frequently shares puzzles and personality tests. The question may be somewhat complicated for many of you, but if you focus for long enough, you might be able to reach the correct answer.
Before you is an incorrect equation: 16+9=-21, made up of 26 matchsticks. You need to move one matchstick to change the equation and arrive at a logical solution. The answer is at the bottom of the article.
Note that there may be several solutions to the equation; we will present only one solution.
Did you succeed? Even if not, it's okay. Here is the answer.
You need to move one matchstick to change the equation. Which matchstick? Move the upper right one from the number 9 and attach it to the minus sign (-) that comes before the 21. This turns the number 9 into the number 5, and the minus sign (-) into a plus sign (+). With this change, we get the correct equation: 16+5=+21.