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d in (-oo:+oo)
(1/4)*d-2 > 18 // - 18
(1/4)*d-18-2 > 0
1/4*d-20 > 0 // + 20
1/4*d > 20 // : 1/4
d > 20/1/4
d > 80
d in (80:+oo)
(80:+oo)
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