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