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