Verified Answer :

AL2006


The only possibility is  -2  and  zero, and I'm not really
all that sure that zero is considered an even number.

Tricky much! ;) Well, as we know, there is no even number going backwards of -2 except zero. So zero could be the possible answer. And -2, an integer could also be a possible answer. Hehehe some might say -1 + (-1) = -2. But that's not true.

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