Finding X values for a given Y coordinate

So, if you're trying to find the modular cubic root, you want to figure out all the possible X values for a specific Y coordinate. Typically, you can get anywhere from 0 up to 3 different X values that correspond to the same Y. Just to update, here's an example with 3 points that have the same Y: calculate their pk values when you already know one of them.

via sagemath

thanks, maybe, if I find my old script I will post later to calculate their respective pk, when one of them is known.

here u go:

I had already found my code but, thanks anyway.