Thats way over my head… and i can´t read half of the handwriting ^.^ But there are some guides online, that explain the basic principles of how to deal with equations with several unknowns, like this one here (if that is one of those):
If you ever figure that out, you then could type in the rest into a math expression node:
Here is another post about it but in C++. You could mimic this in blueprints, but either way you’ll most likely need to play with it a bit to get it working the way you really need it to.