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r in (-oo:+oo)
r/3 > 6 // - 6
r/3-6 > 0
1/3*r-6 > 0 // + 6
1/3*r > 6 // : 1/3
r > 6/1/3
r > 18
r in (18:+oo)
(18:+oo)
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