xyz

What do you need?   IF you need a discreet answer for (x,y,z) you will need TWO MORE equations relating x,y,z.

x = 1

y = 2

z = 3

1 + 2 - 3 = 0

OR

x = 2

y = 1

z = 3

2 + 1 - 3 = 0

There are "e100" ways of possible combinations

x = 231.5

y = 115.75

z = 347.25

231.5 + 115.75 - 347.25 = 0

This is only a few of the "e100" ways of possible equations

("e100" means googol)