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D( x )
x^3-27 = 0
x^3-27 = 0
x^3-27 = 0
1*x^3 = 27 // : 1
x^3 = 27
x^3 = 27 // ^ 1/3
x = 3
x in (-oo:3) U (3:+oo)
(4*x)/(x^3-27) = 0
4*x = 0 // : 4
x = 0
x = 0
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