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D( x )
x = 0
3*x^-3*y^2 = 0
x = 0
x = 0
3*x^-3*y^2 = 0
3*x^-3*y^2 = 0
3*x^-3*y^2 = 0 // : 3*y^2
x^-3 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(2*3*4*x*x^2*x^2*y^4*y^4)/(3*x^-3*y^2) = 0
8*x^8*y^6 = 0 // : 8*y^6
x^8 = 0
x = 0
x in { 0}
x belongs to the empty set
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