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# 2.9: Inverse Property of Addition in Decimal Equations

Difficulty Level: At Grade Created by: CK-12
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### Vocabulary Language: English

The additive inverse or opposite of a number x is -1(x). A number and its additive inverse always sum to zero.

Inverse

Inverse operations are operations that "undo" each other. Multiplication is the inverse operation of division. Addition is the inverse operation of subtraction.

The inverse property of addition states that the sum of any real number and its additive inverse (opposite) is zero. If $a$ is a real number, then $a+(-a)=0$.

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