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