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