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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^6*((2*x^-5*y^7)/14)*y^3 = 0
1/7*x*y^10 = 0 // : 1/7*y^10
x = 0
x in { 0}
x belongs to the empty set
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