(-10) - (+10) + (+10) + (-10) - (-10) = ___
-10
10
-20
-30
(-10) - (+10) + (+10) + (-10) - (-10)
= -10 - 10 + 10 - 10 + 10
= -20 +10 + 0
= -10
(−10)−(+10)+(+10)+(−10)−(−10)+(+10)= ___.