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n in (-oo:+oo)
(18-n)/2 < 6 // - 6
(18-n)/2-6 < 0
(18-n)/2+(-6*2)/2 < 0
18-n-6*2 < 0
6-n < 0
(6-n)/2 < 0
(6-n)/2 < 0 // * 2^2
2*(6-n) < 0
( 2 )
2 < 0
n belongs to the empty set
( 6-n )
6-n < 0
-n < -6 // * -1
n > 6
(-oo:6) (6:+oo) 2 + + 6-n + -
n in (6:+oo)
(6:+oo)
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