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The additive inverse of a number is the value that, when added to the original number, results in zero. For the number 65, the additive inverse is -65, since 65 + (-65) = 0.
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A number and its additive inverse add up to zero. If a number has no sign, add a "-" in front of it to get its additive inverse. The additive inverse of 5 is -5. The additive inverse of x is -x. If a number has a minus sign, take it away to get its additive inverse. The additive inverse of -10 is 10. The additive inverse of -y is y.
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The additive inverse is the sum of two numbers that will equal zero. The additive inverse of -18 is 18.