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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9*(-2/3)*x^-2*x^3*y^-2*y = 0
-6*x*y^-1 = 0 // : -6*y^-1
x = 0
x in { 0}
x belongs to the empty set
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