5 + (2 x 7) - (18/5) = 15.4
1 / 2 * 18 - 5 = 9 - 5 = 4
3
-18
(18/3) + 6 -(2 x 4) = 4
There is no need to simplify this, it is only a sum. 21 + (10/2) - 18 = 8
27
Since minus a negative is the same as a plus, then 18 - (-18) is the same as 18+18 = 36
18
16
18 + 12 + 0 - 4 - 10 = 16
18
-18 + 25 = 7