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