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n in (-oo:+oo)
18-(n/2) < 6 // - 6
18-(n/2)-6 < 0
12-1/2*n < 0 // - 12
-1/2*n < -12 // : -1/2
n > -12/(-1/2)
n > 24
n in (24:+oo)
(24:+oo)
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