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D( x )
-5*x = 0
-5*x = 0
-5*x = 0
-5*x = 0 // : -5
x = 0
x in (-oo:0) U (0:+oo)
-1 = (-5*x)^(-1/3) // - (-5*x)^(-1/3)
-(-5*x)^(-1/3)-1 = 0
-1*x^(-1/3) = 1 // : -1
x^(-1/3) = -1
-1/3 < 0
1/(x^(1/3)) = -1 // * x^(1/3)
1 = -1*x^(1/3) // : -1
-1 = x^(1/3)
x^(1/3) = -1 // ^ 3
x = -1
x = -1
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