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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^8*((72*x^-5*y^13)/16)*y^9 = 0
9/2*x^3*y^22 = 0 // : 9/2*y^22
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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