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D( x )
(10/3)*x = 0
(10/3)*x = 0
(10/3)*x = 0
10/3*x = 0 // : 10/3
x = 0
x in (-oo:0) U (0:+oo)
(((2/3)*x)^1)/3-((((10/3)*x)^-2)/3) = 0
((2/3)*x)/3-((((10/3)*x)^-2)/3) = 0
2/9*x-3/100*x^-2 = 0
x*(2/9-3/100*x^-3) = 0
-3/100*x^-3 = -2/9 // : -3/100
x^-3 = 200/27
-3 < 0
1/(x^3) = 200/27 // * x^3
1 = 200/27*x^3 // : 200/27
27/200 = x^3
x^3 = 27/200 // ^ 1/3
x = (27/200)^(1/3)
x = 0
x = 0
x in { 0}
x = (27/200)^(1/3)
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