SOLUTION: What is the mathematical property that describes the following: -0.8 + 0.5 is the unique real number -0.3?

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Question 475240: What is the mathematical property that describes the following:
-0.8 + 0.5 is the unique real number -0.3?
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
The CLOSURE property of real numbers