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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
0.006*x-(11440/(x^2)) = 0
0.006*x-11440*x^-2 = 0
0.006*x-11440*x^-2 = 0
x*(0.006-11440*x^-3) = 0
-11440*x^-3 = -0.006 // : -11440
x^-3 = 0.00000052
-3 < 0
1/(x^3) = 0.00000052 // * x^3
1 = 0.00000052*x^3 // : 0.00000052
1923076.92307692 = x^3
x^3 = 1923076.92307692 // ^ 1/3
x = 1923076.92307692^(1/3)
x = 0
x = 0
x in { 0}
x = 1923076.92307692^(1/3)
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