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