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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 rule applies here too

 + + = + 
 + – = –
 – + = –
 – – = +

 


Example 1

For the opposites you get

5  ⇒  –5  ⇒  +5

and also

a  ⇒  –a  ⇒  +a

 


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