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d in (-oo:+oo)
-4*d-1 = -2*d-9 // + -2*d-9
9-4*d-(-2*d)-1 = 0
2*d-4*d-1+9 = 0
8-2*d = 0 // - 8
-2*d = -8 // : -2
d = -8/(-2)
d = 4
d = 4
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