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Anonymous
Subtracting 3n from each side gives 12 = 4n or 4n = 12.
n = 12/4
n = 3
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3n = 15 + 12 = 27, 27/3 = 9 = n
n = -6
3n + 6 = n + 202n = 14n = 7
3 + 3n = 9 + 2n + 4n n = -2
n=-9.6