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d in (-oo:+oo)
-(6*d)-(2*d)-10 = 54 // - 54
-(6*d)-(2*d)-54-10 = 0
-6*d-2*d-54-10 = 0
-8*d-64 = 0 // + 64
-8*d = 64 // : -8
d = 64/(-8)
d = -8
d = -8
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