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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = x^(-7/3) // - x^(-7/3)
y-x^(-7/3) = 0
-1*x^(-7/3) = -y // : -1
x^(-7/3) = y
-7/3 < 0
1/(x^(7/3)) = y // * x^(7/3)
1 = x^(7/3)*y // : y
1/y = x^(7/3)
x^(7/3) = 1/y // ^ 3
x^7 = 1/(y^3) // ^ 1/7
x = 1/(y^(3/7))
x = 1/(y^(3/7))
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