Zero. Anything plus zero is whatever you started with.
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The additive identity for rational, real or complex numbers is 0.
The additive identity is a unique element of a set which has the property that adding it to any element of the set leaves the value of that element unchanged. The identity is normally denoted by 0. That is: for any X in the set, X + 0 = 0 + X = X Whether or not the set is commutative, addition of the identity always is. The additive inverse of one element of a set is a member of the set (not necessarily different nor unique) such that the sum of the two is the additive identity. The additive inverse of an element X is normally denoted by -X. Thus, X + (-X) = (-X) + X = 0
zero is the additive identity element.
-27's additive inverse is 27 because when you add them together you get the additive identity, 0.
The additive identity for a set S is a unique element, 0, in the set such that 0 + x = x = x + 0 for all elements x in the set.