The sum of a number and its additive inverse is equal to?

For example, the additive inverse of 12 is - 12. The additive inverse of - 3 is 3. Formally, the additive inverse of x is - x. Note: The sum of a number and its additive inverse is 0.

In math, the additive inverse of a number is the number that, when added to the opposite of that number (usually the opposite of that number like 5 + (-5) = 0), yields zero. So the sum of a number and its additive inverse is equal to 0.