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D( x )
x^4 = 0
x = 0
x^4 = 0
x^4 = 0
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((x^-2*y^3)/(x^4))*y^10)^2 = 0
x^-12*y^26 = 0 // : y^26
x^-12 = 0
x naleu017Cy do O
x belongs to the empty set
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