If

0 * 1 = 0

and

0 * 2 = 0

then the general case

0 * x = 0

looking at this general case I can say

x = 1

which is true, or I can also say

x = 2

which is also true.

Now I have the equation

x + x = 1

and now solving for x the only answer is

x = 1/2

is there a different sign for saying that x = 1/2 and no other possible answer?