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n in (-oo:+oo)
(1/2)*n+18 = 2*n // - 2*n
(1/2)*n-(2*n)+18 = 0
(1/2)*n-2*n+18 = 0
18-3/2*n = 0 // - 18
-3/2*n = -18 // : -3/2
n = -18/(-3/2)
n = 12
n = 12
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