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D( u )
5*u = 0
5*u = 0
5*u = 0
5*u = 0 // : 5
u = 0
u in (-oo:0) U (0:+oo)
(5*u)^(-2/3)*(-3*u)^(5/3) = 0
5^(-2/3)*(-3^(5/3))*u = 0 // : 5^(-2/3)*(-3^(5/3))
u = 0
u in { 0}
u belongs to the empty set
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