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d in (-oo:+oo)
-(5*d)-10 = 5 // - 5
-(5*d)-10-5 = 0
-5*d-10-5 = 0
-5*d-15 = 0 // + 15
-5*d = 15 // : -5
d = 15/(-5)
d = -3
d = -3
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