The sum of a number and its inverse is 0, because that's what "its inverse" means. Inverse is whatever you need to use to "undo" the operation.
For example, (2)+(-2)=0. If you go forward 2, then backward 2, you are where you started.
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If by "opposite" you mean its additive inverse, the answer is 0. If by "opposite" you mean its multiplicative inverse, for the number x, it will be (x+1/x).
0. By the definition of "additive inverse", the sum of ANY number and its additive inverse must be 0.
It is 0.
The sum of any integer ( n ) and zero is ( n ).
The opposite of an integer is the integer that, when added to it, results in a sum of zero. In this case, the opposite of -6 is 6, since -6 + 6 = 0. The opposite integer is also known as the additive inverse.