I don't know if it's possible to find but ideally I would like a function for solving each equation (a, b, c) = fn(x, y, z). Even if implementation isn't available at least the equations would be good.
The list is too wide and too difficult to use without understanding them. Wolfram Alpha (as suggested by a sibling comment) is quite good and they have a lot of docs. Wikipedia can help too. There are a fwe additional sites.
But without understanding "why" it's difficult to give more personalized advice.