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d in (-oo:+oo)
5-(5*d) = 25 // - 25
5-(5*d)-25 = 0
5-5*d-25 = 0
-5*d-20 = 0 // + 20
-5*d = 20 // : -5
d = 20/(-5)
d = -4
d = -4
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