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D( x )
4*x^4 = 0
4*x^4 = 0
4*x^4 = 0
4*x^4 = 0 // : 4
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
140/(4*x^4) = 0
35*x^-4 = 0 // : 35
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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