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n in (-oo:+oo)
18-((2/3)*n) = 8 // - 8
18-((2/3)*n)-8 = 0
(-2/3)*n-8+18 = 0
10-2/3*n = 0 // - 10
-2/3*n = -10 // : -2/3
n = -10/(-2/3)
n = 15
n = 15
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