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