15 - n when n equals 9 = 6
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n X .15 = 9 9 / .15 = n 9 / .15 = 60
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
It is an equation and the value of n is 6
n=6