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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-3*((4*x^11*y^6)/12)*y^8 = 0
1/3*x^8*y^14 = 0 // : 1/3*y^14
x^8 = 0
x = 0
x in { 0}
x belongs to the empty set
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