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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-3*((18*x^5*y^4)/12)*y^-3 = 0
3/2*x^2*y = 0 // : 3/2*y
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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