Answer:
0
Step-by-step explanation:
-x + x - (a + b) + (a + b)
Distribute the negative sign into (a + b).
-x + x - a - b + a + b
Notice how each term has itself and an opposite (For example x and - x)
These terms add up to zero .
Thus, when all of the terms are added up, the result is 0.
