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R in (-oo:+oo)
R/15 > 3 // - 3
R/15-3 > 0
1/15*R-3 > 0 // + 3
1/15*R > 3 // : 1/15
R > 3/1/15
R > 45
R in (45:+oo)
(45:+oo)
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