Problem7
This is a math problem. If you can solve it, please comment your solution into the comment field or link your solution page URL in the comment field. I would check it.
The prepared solution file is linked on the below page (math-pro*.pdf). Since this original solution was already posted into @takashishinzato on Instagram, if you want to know about it, please check Instagram. If you can support this educational activity, please purchase it.
Note that this solution file is for free. You can check it.
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