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D( x )
x = 0
x^-3 = 0
x = 0
x = 0
x^-3 = 0
x^-3 = 0
1*x^-3 = 0 // : 1
x^-3 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((x^9*y^6)/(x^-3))*y^2 = 0
x^12*y^8 = 0 // : y^8
x^12 = 0
x = 0
x in { 0}
x belongs to the empty set
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