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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)
8*x-(6*x)-(48/(x^2)) = 0
8*x-6*x-48*x^-2 = 0
2*x-48*x^-2 = 0
2*x*(1-24*x^-3) = 0
-24*x^-3 = -1 // : -24
x^-3 = 1/24
-3 < 0
1/(x^3) = 1/24 // * x^3
1 = 1/24*x^3 // : 1/24
24 = x^3
x^3 = 24 // ^ 1/3
x = 2*3^(1/3)
2*x = 0
2*x = 0 // : 2
x = 0
x in { 0}
x = 2*3^(1/3)
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