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Anonymous
n + 6 = 18
n = 12
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n + 5 = 18 n = 13
N+18=30. Subtract 18 both sides N=12
n=6
n + 18 = 27 subtract 18 to 18 and 27 18-27=9 n = 9
3n + 6 = n + 202n = 14n = 7