It can be anything, depending on the values of "a" and "b".
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Positive plus positive equals positive. Negative plus negative equals negative. Positive greater than negative equals positive. Negative greater than positive equals negative.
0, Because you don't know how negative or how positive! 0, Because you don't know how negative or how positive!
Because the two negatives cancel each other out and become a plus
positive plus positive equals positive negative plus negative equals negative
negative plus positive equals to zero