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As it appears the only thing it illustrates is the identity property ie anything is equal to itself.

If there were brackets: (2 + 8 ) + 7 = 2 + (8 + 7) then that would illustrate the associative property of addition of numbers.

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Q: What property does the following example illustrate 2 plus 8 plus 7 equals 2 plus 8 plus 7?
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