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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((8*x^-6)^1)/3 = 0
(8*x^-6)/3 = 0
8/3*x^-6 = 0 // : 8/3
x^-6 = 0
x naleu017Cy do O
x belongs to the empty set
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