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d in (-oo:+oo)
(5/6)*d-(8*d)-9 = 0
(5/6)*d-8*d-9 = 0
-43/6*d-9 = 0 // + 9
-43/6*d = 9 // : -43/6
d = 9/(-43/6)
d = -54/43
d = -54/43
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