zero
one cancels out the other
-9+9 = 0
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a positive plus a negative is a positive example 9-(-2) you would change the double negative to a positive hope this helped :)
-9 + 9 = 0
1 plus negative 10 is equal to -9.
7 + (-9) = 7 - 9 = -2
The sum of +9 and -11 is -2.