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The [multiplicative] opposite of -2 is -0.5, which is negative.
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The (not th) definition (not defition) of opposite integers are integers that are equal in their [absolute] value but have different signs. So, for example, the opposite of +4 is -4, and the opposite of -5 is +5.
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If by "opposite" you mean "additive inverse", the sum is zero. For example, 5 + (-5) = 0.