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D( x )
15*x^(6/5) = 0
15*x^(6/5) = 0
15*x^(6/5) = 0
15*x^(6/5) = 0 // : 15
x^(6/5) = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^2)/(15*x^(6/5)) = 0
1/3*x^(4/5) = 0 // : 1/3
x^(4/5) = 0
x = 0
x in { 0}
x belongs to the empty set
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