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n in (-oo:+oo)
n/9 < n/2-(1/3) // - n/2-(1/3)
n/9-(n/2)+1/3 < 0
1/3-7/18*n < 0 // - 1/3
-7/18*n < -1/3 // : -7/18
n > -1/3/(-7/18)
n > 6/7
n in (6/7:+oo)
(6/7:+oo)
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