If by "opposite" you mean "additive inverse", the sum is zero. For example, 5 + (-5) = 0.
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If the opposite is meant to be the additive opposite and not the multiplicative opposite, then their sum is zero. The reason is that is what defines an additive opposite!
The sum of a number plus 3 to the square root of 9 to the sum of 2 would equal -2. This is a math problem.
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