[X4]

Asking: Isn't the only true solution the one using Decibels for Addition? Because everyone else either just redefines or overwrites a value. Also addition of decibels cannot be disproofed as fake.

[NaNaN]

After thinking for a while, I found that there is no true answer. If we are not dealing with normal calculating, every answer should redefine the calculating system or value in a tricky way. The simplest answer I can tell related to the addition of decibels is like this:

    function add(a, b): return 5

But it is just not so fun.