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D( x )
(x^5)/6 = 0
(x^5)/6 = 0
(x^5)/6 = 0
1/6*x^5 = 0 // : 1/6
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^4)/3)/((x^5)/6) = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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