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Here’s a little puzzle that has been entertaining all kinds of people I know during lockdown!

It’s harder than it looks:

algebra picture puzzle

I think it’s 43… 😁

Answer in the comments?

And if you know where this came from, please let me know as I’d like to find more of them!

(I've searched on tineye and found it on this Russian-language website, but I don't know if that's the original as it has another picture I've seen before as well: