It is an equation and the value of n is 6
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If you know that n = 15, substitute 15 for n and solve: n + 3 - 9 15 + 3 - 9 9
15 + n = 24 (subtract 15 from both sides) n = 9
n=6
15 - n when n equals 9 = 6
3n = 15 + 12 = 27, 27/3 = 9 = n