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n in (-oo:+oo)
18-((2/3)*n) = 12 // - 12
18-((2/3)*n)-12 = 0
(-2/3)*n-12+18 = 0
6-2/3*n = 0 // - 6
-2/3*n = -6 // : -2/3
n = -6/(-2/3)
n = 9
n = 9
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