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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(64*x^3*y^-3)^(2/3)*(x^(-2/3)*y^(1/6))^6 = 0
16*x^-2*y^-1 = 0 // : 16*y^-1
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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