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n in (-oo:+oo)
15-((1/3)*n) = 9 // - 9
15-((1/3)*n)-9 = 0
(-1/3)*n-9+15 = 0
6-1/3*n = 0 // - 6
-1/3*n = -6 // : -1/3
n = -6/(-1/3)
n = 18
n = 18
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