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D( x )
y^-7 = 0
x = 0
y^-7 = 0
y^-7 = 0
y^-7 = 0
x naleu017Cy do R
x = 0
x = 0
x belongs to the empty set
x^5*(((((x^-2*y^5)^1)/2)/(y^-7))/4) = 0
x belongs to the empty set
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