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d in (-oo:+oo)
(1/8)*d-d+(3/8)*d-4 = 5 // - 5
(1/8)*d-d+(3/8)*d-5-4 = 0
-1/2*d-9 = 0 // + 9
-1/2*d = 9 // : -1/2
d = 9/(-1/2)
d = -18
d = -18
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