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d in (-oo:+oo)
-9 = 5*d+d-3 // - 5*d+d-3
3-(5*d)-d-9 = 0
3-5*d-d-9 = 0
-6*d-6 = 0 // + 6
-6*d = 6 // : -6
d = 6/(-6)
d = -1
d = -1
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