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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = 1-((27*x^2)/(x^3)) // - 1-((27*x^2)/(x^3))
Y+(27*x^2)/(x^3)-1 = 0
27*x^-1 = -(Y-1) // : 27
x^-1 = (1-Y)/27
-1 < 0
1/(x^1) = (1-Y)/27 // * x^1
1 = x^1*((1-Y)/27) // : (1-Y)/27
27*(1-Y)^-1 = x^1
x = 27*(1-Y)^-1
x = 27*(1-Y)^-1
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