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d in (-oo:+oo)
(5/8)*d = 6/18 // - 6/18
(5/8)*d-(6/18) = 0
(5/8)*d-1/3 = 0
5/8*d-1/3 = 0 // + 1/3
5/8*d = 1/3 // : 5/8
d = 1/3/5/8
d = 8/15
d = 8/15
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