What is the sum of the first ten negative integer and the first ten positive integer?

The sum of the first ten positive integers, i.e. 1,2,3,4,5,6,7,8,9, and 10, is 55.

The sum of the first ten negative integers, i.e. -1,-2,-3,-4,-5,-6,-7,-8,-9, and -10 is -55.

The sum of the first ten positive integers plus the sum of the first ten negative integers is 0.