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r in (-oo:+oo)
(7/3)*r-r > 8 // - 8
(7/3)*r-r-8 > 0
4/3*r-8 > 0 // + 8
4/3*r > 8 // : 4/3
r > 8/4/3
r > 6
r in (6:+oo)
(6:+oo)
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