Glossary
Additive inverse
Additive Inverse (AD•di•tive IN•verse)
Example: In the equation 3 + -3 = 0,
        3 and -3 are additive inverses of each other because
when you add them their sum is zero.
The additive inverse of a number is also called its
opposite.  For example, 4 + -4 = 0.  The additive inverse of
4 is –4, and the additive inverse of –4 is 4
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