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x in (-oo:+oo)
x/(-6) > -5 // + 5
x/(-6)+5 > 0
5-1/6*x > 0 // - 5
-1/6*x > -5 // : -1/6
x < -5/(-1/6)
x < 30
x in (-oo:30)
(-oo:30)
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