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d in (-oo:+oo)
-(2*d)-3 = -9 // + 9
9-(2*d)-3 = 0
9-2*d-3 = 0
6-2*d = 0 // - 6
-2*d = -6 // : -2
d = -6/(-2)
d = 3
d = 3
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