noob here. Math really confused me. However when I saw your solution, it really made sense in my brain. I guess it was how the equations were written in detail that got me afraid. Im guessing you didnt even put the third equation, recovered since it was not in the test??

I do not understand why we need the logical "or" operator with "a-b" at the end?
Edit: I got it now. In case, the same values, comparing the real values instead.

Which discourse?

What values does x and y take?

Can you eloborate on the solution?