5d ≤ d
5d - d ≤ 0
4d ≤ 0
d ≤ 0
Ответ : при d ∈ (- ∞ ; 0]
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5d ≤ d
5d - d ≤ 0
4d ≤ 0
d ≤ 0
Ответ : при d ∈ (- ∞ ; 0]