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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-1*((8*x^2*y^-3)/30)*y^2 = 0
4/15*x*y^-1 = 0 // : 4/15*y^-1
x = 0
x in { 0}
x belongs to the empty set
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