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r in (-oo:+oo)
6-((4/5)*r) > 18 // - 18
6-((4/5)*r)-18 > 0
(-4/5)*r-18+6 > 0
-4/5*r-12 > 0 // + 12
-4/5*r > 12 // : -4/5
r < 12/(-4/5)
r < -15
r in (-oo:-15)
(-oo:-15)
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