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# Opposite number

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**Opposite number** or **additive inverse** of any number *n* is a number which, if added to *n*, results in 0, the identity element of addition. The opposite number for *n* is written as *−n*. For example, −7 is opposite to 7, because [math]-\!7 + 7 = 0[/math]. You can say that the opposite number of a number, is the negative version of the positive number.

Use absolute value witch means the distance between a number and 0