Multiple outcomes..? I don't quite Get what you ment.. x, y, and z does not have to be the same number.. therefor different names, bit yet they could be the exact same in your equation.
And no, x, y and z will not give you multiple outcomes of the same, let's say, x.
x is x is your equation and that won't change
say x = 5457912602
z = 1
y = 10612134962648607623
( 5457912602 - 5457912601 ) = ( Z ) = ( 10612134962648607623 + 10612134962648607622 )
then IT would be 1 = 1 = 1
or x is 1, z is 1, and y is 1
then they would all be different