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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-8*(((3*x^2*y^-3)^3)/54)*y^-10 = 0
1/2*x^-2*y^-19 = 0 // : 1/2*y^-19
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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