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d in (-oo:+oo)
(3/8)*d-(4/9) = (5/8)*d+9 // - (5/8)*d+9
(3/8)*d-((5/8)*d)-(4/9)-9 = 0
(3/8)*d+(-5/8)*d-4/9-9 = 0
-1/4*d-85/9 = 0 // + 85/9
-1/4*d = 85/9 // : -1/4
d = 85/9/(-1/4)
d = -340/9
d = -340/9
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