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D( d )
5-(3*d) = 0
5-(3*d) = 0
5-(3*d) = 0
5-3*d = 0
5-3*d = 0 // - 5
-3*d = -5 // : -3
d = -5/(-3)
d = 5/3
d in (-oo:5/3) U (5/3:+oo)
(8*d-5)/(5-(3*d)) = 0
(8*d-5)/(5-3*d) = 0
8*d-5 = 0 // + 5
8*d = 5 // : 8
d = 5/8
d = 5/8
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