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d in (-oo:+oo)
8-(6*d) = 20 // - 20
8-(6*d)-20 = 0
8-6*d-20 = 0
-6*d-12 = 0 // + 12
-6*d = 12 // : -6
d = 12/(-6)
d = -2
d = -2
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