Question 21885
let x equal the first number and since they are consecutive the second number is x+1
set up your equation

x + (x+1)= x - (x+1)
2x +1 = x -x -1
2x=-2
x=-1
x+ 1 = 0

check  -1 + ( -1 + 1)= -1 - (-1+1)
-1=-1