A few years ago, while I was working as a freelancer, I did something very stupid. On a freelancing website someone posted a few exercises about ordinary differential equations and asked someone to solve them (I don't remember the details exactly, but I think it's safe to assume it was their homework).
I did the project. That's the only time that I cheated and I regret it. Now I'm an undergraduate student and am thinking about going to graduate school and maybe even getting a job in academia after finishing graduate school (I dropped out of the school and just started the school this year, and that's why I'm still an undergrad).
What are the possible consequences of what I did and what should I do now? Should I tell it in my resume (for graduate school and possibly when I want to get a job in future) or just pretend it didn't happen or something else?