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D( x )
x^3-1 = 0
x^3-1 = 0
x^3-1 = 0
1*x^3 = 1 // : 1
x^3 = 1
x^3 = 1 // ^ 1/3
x = 1
x in (-oo:1) U (1:+oo)
(5*x^5)/(x^3-1) = 0
5*x^5 = 0 // : 5
x^5 = 0
x = 0
x = 0
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