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d in (-oo:+oo)
-(2*d)-8 = 6*d-16 // - 6*d-16
16-(2*d)-(6*d)-8 = 0
16-2*d-6*d-8 = 0
8-8*d = 0 // - 8
-8*d = -8 // : -8
d = -8/(-8)
d = 1
d = 1
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