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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(30*x^-2)/3-((x^1)/3) = 0
(30*x^-2)/3-(x/3) = 0
10*x^-2-1/3*x = 0
x*(10*x^-3-1/3) = 0
10*x^-3 = 1/3 // : 10
x^-3 = 1/30
-3 < 0
1/(x^3) = 1/30 // * x^3
1 = 1/30*x^3 // : 1/30
30 = x^3
x^3 = 30 // ^ 1/3
x = 30^(1/3)
x = 0
x = 0
x in { 0}
x = 30^(1/3)
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