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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-3*((24*x^4*y^8)/3)*y^2 = 0
8*x*y^10 = 0 // : 8*y^10
x = 0
x in { 0}
x belongs to the empty set
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