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D( x )
35*x^4 = 0
35*x^4 = 0
35*x^4 = 0
35*x^4 = 0 // : 35
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(15*x^2)/(35*x^4) = 0
3/7*x^-2 = 0 // : 3/7
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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