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D( x )
x = 0
5^6*x^-5*y^8 = 0
x = 0
x = 0
5^6*x^-5*y^8 = 0
5^6*x^-5*y^8 = 0
15625*x^-5*y^8 = 0 // : 15625*y^8
x^-5 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(5^3*x^2*y^4)/(5^6*x^-5*y^8) = 0
1/125*x^7*y^-4 = 0 // : 1/125*y^-4
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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