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D( d )
(2*d)/81-(d/65) = 0
(2*d)/81-(d/65) = 0
(2*d)/81-(d/65) = 0
49/5265*d = 0 // : 49/5265
d = 0
d in (-oo:0) U (0:+oo)
d/((2*d)/81-(d/65)) = 0
d/(49/5265*d) = 0
d = 0
d in { 0}
d belongs to the empty set
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