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r in (-oo:+oo)
(2*r)/3 < 3 // - 3
(2*r)/3-3 < 0
2/3*r-3 < 0 // + 3
2/3*r < 3 // : 2/3
r < 3/2/3
r < 9/2
r in (-oo:9/2)
(-oo:9/2)
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