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r in (-oo:+oo)
-2*r < 6-((2*r)/5) // - 6-((2*r)/5)
(2*r)/5-2*r-6 < 0
-8/5*r-6 < 0 // + 6
-8/5*r < 6 // : -8/5
r > 6/(-8/5)
r > -15/4
r in (-15/4:+oo)
(-15/4:+oo)
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