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D( x )
x^3 = 0
x^2 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
36/(x^3)-(6/(x^2)) = 0
36/(x^3)-6*x^-2 = 0
36*x^-3-6*x^-2 = 0
(36*x^0-6*x^1)/(x^3) = 0 // * x^6
x^3*(36*x^0-6*x^1) = 0
x^3
36-6*x = 0
-6*x^1 = -36 // : -6
x^1 = 6
x = 6
x in { 6}
x = 6
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