Question

The sum of any number and its ______
equals 0.

Answer 1

The sum of the real number (a) and its opposite real number (-a) is zero

Explanation:

5 + (-5) = 0 and (-5) + 5 = 0

or, 5 - 5 = 0 and -5 + 5 = 0

Here 5 is real number and (-5) is it's opposite real number. Sum of 5 and (-5) is zero.