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x in (-oo:+oo)
(-1/6)*x < -18 // + 18
(-1/6)*x+18 < 0
18-1/6*x < 0 // - 18
-1/6*x < -18 // : -1/6
x > -18/(-1/6)
x > 108
x in (108:+oo)
(108:+oo)
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