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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^5*((25*x^-3*y^-2)/35)*y^4 = 0
5/7*x^2*y^2 = 0 // : 5/7*y^2
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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