SOLUTION: What property of real number is this? 9+(-9)=0

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Question 757449: What property of real number is this? 9+(-9)=0
Answer by MathLover1(20850) About Me  (Show Source):
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Additive Inverse (Opposite)
For every real number a there exist a real number, denoted -a, such that
a+%2B+%28-a%29+=+0