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If by "opposite" you mean "additive inverse", the sum is zero. For example, 5 + (-5) = 0.

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Q: What is the sum of a number plus its opposite?
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When the sum of a number plus 3 is squared it is 9 more than the sum of the number plus 2 when squared?

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When the sum of a number plus 3 is squared it is 9 more than the sum of the number plus 2 when squares?

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When the sum of the number plus 3 is squared it is 9 more than the sum of the number plus 2 when squared?

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