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f in (-oo:+oo)
-72 < f/(-6) // - f/(-6)
-(f/(-6))-72 < 0
1/6*f-72 < 0 // + 72
1/6*f < 72 // : 1/6
f < 72/1/6
f < 432
f in (-oo:432)
(-oo:432)
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