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d in (-oo:+oo)
d-(3*d)+7 = 27 // - 27
d-(3*d)-27+7 = 0
d-3*d-27+7 = 0
-2*d-20 = 0 // + 20
-2*d = 20 // : -2
d = 20/(-2)
d = -10
d = -10
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