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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((3*x^-4)/27)*x^2 = 0
1/9*x^-2 = 0 // : 1/9
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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