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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x = x^(-7/3) // - x^(-7/3)
x-x^(-7/3) = 0
x-x^(-7/3) = 0
x*(1-x^(-10/3)) = 0
-1*x^(-10/3) = -1 // : -1
x^(-10/3) = 1
-10/3 < 0
1/(x^(10/3)) = 1 // * x^(10/3)
1 = 1*x^(10/3) // : 1
1 = x^(10/3)
x^(10/3) = 1 // ^ 3
x^10 = 1 // ^ 1/10
abs(x) = 1
x = 1 or x = -1
x = 0
x = 0
x in { 0}
x in { 1, -1 }
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