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