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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2+3/(x^3) = 0
x^2+3*x^-3 = 0
x^2*(3*x^-5+1) = 0
3*x^-5 = -1 // : 3
x^-5 = -1/3
-5 < 0
1/(x^5) = -1/3 // * x^5
1 = -1/3*x^5 // : -1/3
-3 = x^5
x^5 = -3 // ^ 1/5
x = -3^(1/5)
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x = -3^(1/5)
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