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d in (-oo:+oo)
-4 = (2/8)*d // - (2/8)*d
-((2/8)*d)-4 = 0
(-1/4)*d-4 = 0
-1/4*d-4 = 0 // + 4
-1/4*d = 4 // : -1/4
d = 4/(-1/4)
d = -16
d = -16
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