Answer :
x + 10 = -13 (original problem)
-10 -10 (subtract 10 from each side)
The 10 - 10 equals 0 so it cancels out of the problem.
x = -23 <- (-13 - 10 = -23)
-10 -10 (subtract 10 from each side)
The 10 - 10 equals 0 so it cancels out of the problem.
x = -23 <- (-13 - 10 = -23)
