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This post has received a 18.82 % upvote from @booster thanks to: @deusericius.

And you can only move one line/match?

yes, only one

I have a couple of ideas, but they are both long shots:

number 7, so it says 2 1 2 = 5. There are no symbols though so there is a lot of assumption involved

Or number 12, and move it between 15 and 18 so it reads 2 + 7 = 9. It's not a traditional 7 but it kind of looks like a 7

There is a way with a clear solution. Your second way is a good idea, but for this kind of riddles all numbers are displayed like a digital clock

Yep, got it. It seems so obvious now...

Move 4 to the other side, so it is still between 3 and 5. So now it should read:

3 +2 = 5

correct :)

Woww it's so easyonce you know what the answer is

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