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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)
(X-6)/(x^2)-(6*x) = 0
(X-6)/(x^2)-6*x = 0
(X-6)/(x^2)+(-6*x*x^2)/(x^2) = 0
X-6*x*x^2-6 = 0
X-6*x^3-6 = 0
(X-6*x^3-6)/(x^2) = 0
(X-6*x^3-6)/(x^2) = 0 // * x^2
X-6*x^3-6 = 0
-6*x^3 = -(X-6) // : -6
x^3 = (6-X)/(-6)
x^3 = (6-X)/(-6) // ^ 1/3
x = ((6-X)^(1/3))/(-6^(1/3))
x = ((6-X)^(1/3))/(-6^(1/3))
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