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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-8*((3^-6*x^-5*y^2)/(3^-3))*y^2 = 0
1/27*x^-13*y^4 = 0 // : 1/27*y^4
x^-13 = 0
x naleu017Cy do O
x belongs to the empty set
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