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r in (-oo:+oo)
(1/3)*r > 3-(1/2) // - 3-(1/2)
(1/3)*r+1/2-3 > 0
1/3*r-5/2 > 0 // + 5/2
1/3*r > 5/2 // : 1/3
r > 5/2/1/3
r > 15/2
r in (15/2:+oo)
(15/2:+oo)
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