Zero
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Because an integer is a whole number and the sum of any two or more whole numbers is always a whole number.
An integer is just a whole number, excluding zero. Any positive integer will always have an opposite just by placing a negative sign in front of the positive integer. You can also say that any negative whole number is an integer.
If we define "opposite" as the additive inverse, the sum is zero.
the positive integer
the opposite of a sum is the difference