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D( x )
x^4 = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
w^22*((1*(25/4))/(x^4)) = 0
w^22*((25/4)/(x^4)) = 0
25/4*w^22*x^-4 = 0 // : 25/4*w^22
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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