Cheat Engine

[Freiza]

suppose var1 == 11001111
var2 == 00000100

var1 + var 2 == 00000100 (let us say it var 3)

what operation on var3 can i make so that i can get var1 again for any numbers.

ie var3 (some operation) (value) = var1

[Slugsnack]

i fucked up, poster below has it right

[XaLeX]

You can't.
0 & 0 = 0 & 1 = 1 & 0 = 0
this means that a zero in var3 can be originated by three combinations of var1 and var2, and you can't just "reverse" it.

The only thing you can tell is what bits of both var1 and var2 are surely set, that is, the ones that are set in var3.

[Freiza]

i thought as xoring twice brings up the same result .
then there must be some way out..

[Slugsnack]

think about it logically. if you have a 0 result bit and you know one of the original bits was 1 then yes, the other is 0. if the other original bit you do know was 0 however you don't know what the other bit could've been.