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d in (-oo:+oo)
8-(6*d) = 4*d+108 // - 4*d+108
8-(6*d)-(4*d)-108 = 0
8-6*d-4*d-108 = 0
-10*d-100 = 0 // + 100
-10*d = 100 // : -10
d = 100/(-10)
d = -10
d = -10
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