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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2*((4*x^-4*y^6)/10)*y^-3 = 0
2/5*x^-2*y^3 = 0 // : 2/5*y^3
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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