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d in (-oo:+oo)
d/(-7) > 3 // - 3
d/(-7)-3 > 0
-1/7*d-3 > 0 // + 3
-1/7*d > 3 // : -1/7
d < 3/(-1/7)
d < -21
d in (-oo:-21)
(-oo:-21)
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