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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)
6*x-(5*x)-(30/(x^2)) = 0
6*x-5*x-30*x^-2 = 0
x-30*x^-2 = 0
x*(1-30*x^-3) = 0
-30*x^-3 = -1 // : -30
x^-3 = 1/30
-3 < 0
1/(x^3) = 1/30 // * x^3
1 = 1/30*x^3 // : 1/30
30 = x^3
x^3 = 30 // ^ 1/3
x = 30^(1/3)
x = 0
x = 0
x in { 0}
x = 30^(1/3)
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