Finding the variable in which two functions are the same

I have a problem and two ways came to my mind by I could not manage to find how to solve it.

I have two functions, A = a(x, y) and B = b(z, h). and we have y, z, h in these two functions. But we should find x provided that A = B.

Now either we can find the x via solving equation that I do not know how in python. In this way we should find x .

or we can use

a = (x, y)
b = (h, p)
If a == b:
   print(a, b)
else:
   pass

but it is not acceptable to use ==. This way can be used when we define a for loop for x and for instance from other that give out variables the answer of functions after calculation are for loops we have a= 1.5e-25, 5.6e-29, 1.3e-24 and etcandb= 3.5e-24, 1.2e-28, 1.7e-24which the answer will be1.7e-24`

I hope I explained it clearly.

any help please?