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d in (-oo:+oo)
-2*d-9 = 4*d+27 // - 4*d+27
-2*d-(4*d)-27-9 = 0
-2*d-4*d-27-9 = 0
-6*d-36 = 0 // + 36
-6*d = 36 // : -6
d = 36/(-6)
d = -6
d = -6
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