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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)
2*x-(108/(x^2)) = 0
2*x-108*x^-2 = 0
2*x-108*x^-2 = 0
2*x*(1-54*x^-3) = 0
-54*x^-3 = -1 // : -54
x^-3 = 1/54
-3 < 0
1/(x^3) = 1/54 // * x^3
1 = 1/54*x^3 // : 1/54
54 = x^3
x^3 = 54 // ^ 1/3
x = 3*2^(1/3)
2*x = 0
2*x = 0 // : 2
x = 0
x in { 0}
x = 3*2^(1/3)
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