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d in (-oo:+oo)
-2*d-5 = 6*d+11 // - 6*d+11
-2*d-(6*d)-11-5 = 0
-2*d-6*d-11-5 = 0
-8*d-16 = 0 // + 16
-8*d = 16 // : -8
d = 16/(-8)
d = -2
d = -2
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