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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-3*((3*x^4*y^5)/2)*y^4)^2 = 0
9/4*x^2*y^18 = 0 // : 9/4*y^18
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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