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d in (-oo:+oo)
3*(-(6*d)-3) = 27 // - 27
3*(-(6*d)-3)-27 = 0
3*(-6*d-3)-27 = 0
3*(-6*d-3)-27 = 0
-18*d-36 = 0
-18*d-36 = 0
-18*d-36 = 0 // + 36
-18*d = 36 // : -18
d = 36/(-18)
d = -2
d = -2
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