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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-3/5)*((x^2)/3) = 0
1/3*x^(7/5) = 0 // : 1/3
x^(7/5) = 0
x = 0
x in { 0}
x belongs to the empty set
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