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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((10*x*((3*x^8*y^3)/6)*y)/(x^2))*y^6 = 0
5*x^7*y^10 = 0 // : 5*y^10
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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