Thanks for letting other people have their fun too. Good hint, this should help them.

This one is indeed likely a bit easy for you~~

south_korea_ln

Here's a hint: $$k$$ shows up on the right hand side of the equation too... 

Then you can do a simple guess and check...

SimpleStacker

science

Solve
$$
k = \sqrt{7 - \sqrt{7 + \sqrt{7 - \sqrt{7 + \cdots}}}}
$$

Previous iteration: https://stacker.news/items/807847/r/south_korea_ln (solution in https://stacker.news/items/807847/r/south_korea_ln?commentId=809723)
Nice puzzle by @SimpleStacker in https://stacker.news/items/812338/r/south_korea_ln, too.

