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d in (-oo:+oo)
(3*d)/5 < 25 // - 25
(3*d)/5-25 < 0
3/5*d-25 < 0 // + 25
3/5*d < 25 // : 3/5
d < 25/3/5
d < 125/3
d in (-oo:125/3)
(-oo:125/3)
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