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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-8*((3^-9*x^-5*y^3)/(3^-6))*y^6 = 0
1/27*x^-13*y^9 = 0 // : 1/27*y^9
x^-13 = 0
x naleu017Cy do O
x belongs to the empty set
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