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r in (-oo:+oo)
(2/3)*r < 6 // - 6
(2/3)*r-6 < 0
2/3*r-6 < 0 // + 6
2/3*r < 6 // : 2/3
r < 6/2/3
r < 9
r in (-oo:9)
(-oo:9)
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