If x=y=x+y, find the value of (2=3)=5?

2 answers

That makes no sense to me.
It looks like you are using "=" as an operator. I'll change it to @, giving us
if x@y = x+y, then
(2@3)@5 = (2+3)@5 = 5@5 = 5+5 = 10

If that's not what you had in mind, then maybe you can elucidate.