An engineering question

Hello there, This post has nothing to do with Lol. I need help finding a problem which requires solving a high number of equations. ( hundred or maybe thousands). I have searched through google but i can’t seem to find such a problem. I just need to know some kind of problems that require such huge number of equations. Please if anybody has any idea, feel free to share it.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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