Let's solve for x:
100 - (45 + x) - 18 = 125100 - 45 - x - 18 = 12555 - x - 18 = 12537 - x = 125-x = 125 - 37-x = 88x = -88
Therefore, x = -88.
Let's solve for x:
100 - (45 + x) - 18 = 125
100 - 45 - x - 18 = 125
55 - x - 18 = 125
37 - x = 125
-x = 125 - 37
-x = 88
x = -88
Therefore, x = -88.