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7y + 18 = 39 Therefore, 7y = 39 - 18 = 21 y = 21/7 y = 3
39-15+18 6x3 Answer: 25
3n+18 = 39 -4n 3n+4n = 39 -18 7n = 21 n = 3
I think it's -39
13 + 16 + 18 + 20 + 21 + 26 + 27 + 27 + 28 + 36 + 39 + 42 + 43 = 356