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D( x )
x = 0
x^-2 = 0
x = 0
x = 0
x^-2 = 0
x^-2 = 0
1*x^-2 = 0 // : 1
x^-2 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
x^-9*(8/(x^-2))*((5*x^1*y^1)/4)*y^8 = 0
x^-9*(8/(x^-2))*((5*x*y)/4)*y^8 = 0
10*x^-6*y^9 = 0 // : 10*y^9
x^-6 = 0
x naleu017Cy do O
x belongs to the empty set
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