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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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