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Additive inverse
The opposite of a number is created by changing the sign.
Explanation
By replacing a plus sign by a minus sign the opposite is created. Conversely, you can replace a minus sign by a plus sign. A number without a sign is considered positive. Of course the basic rules apply here too
+ + = +
+ – = –
– + = –
– – = +
Example 1
For the opposites you get
and also