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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
z^0*x^5*((27*x^-2*y^6)/3)*y^2 = 0
x^5*((27*x^-2*y^6)/3)*y^2 = 0
9*x^3*y^8 = 0 // : 9*y^8
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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