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n in (-oo:+oo)
18-((1/3)*n) = 9 // - 9
18-((1/3)*n)-9 = 0
(-1/3)*n-9+18 = 0
9-1/3*n = 0 // - 9
-1/3*n = -9 // : -1/3
n = -9/(-1/3)
n = 27
n = 27
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