It is zero.
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0 is the identity
Identity property of addition states that the sum of zero and any number or variable is the number or variable itself. 3 + 0 = 3
Additive identity = 0Multiplicative identity = 1.
It is the "additive identity".
The identity property for addition states that there is a number, 0, such that x + 0 = 0 + x = x for all numbers x.