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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)
5*x-(1.5/(x^2)) = 0
5*x-1.5*x^-2 = 0
5*x-1.5*x^-2 = 0
x*(5-1.5*x^-3) = 0
-1.5*x^-3 = -5 // : -1.5
x^-3 = 3.33333333
-3 < 0
1/(x^3) = 3.33333333 // * x^3
1 = 3.33333333*x^3 // : 3.33333333
0.3 = x^3
x^3 = 0.3 // ^ 1/3
x = 0.3^(1/3)
x = 0
x = 0
x in { 0}
x = 0.3^(1/3)
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