18
-39 + 18 = -21 it is the same as saying 18-39.
The sum of -18 and 39 is 21.
7y + 18 = 39 Therefore, 7y = 39 - 18 = 21 y = 21/7 y = 3
3n+18 = 39 -4n 3n+4n = 39 -18 7n = 21 n = 3
39 + 39 + 39 + 39 + 39 + 39 = 234
15
18
The sum of 39 and -96 is -57.
59
273
61