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D( x )
x^5 = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
y^6*((3*x^10*y^8*z^2)/(x^5))*z^11 = 0
3*x^5*y^14*z^13 = 0 // : 3*y^14*z^13
x^5 = 0
x = 0
x in { 0}
x belongs to the empty set
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