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D( x )
3*x^2*y^4*z^2 = 0
3*x^2*y^4*z^2 = 0
3*x^2*y^4*z^2 = 0
3*x^2*y^4*z^2 = 0 // : 3*y^4*z^2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-15*x^3*y^5*z^2)/(3*x^2*y^4*z^2) = 0
-5*x*y = 0 // : -5*y
x = 0
x in { 0}
x belongs to the empty set
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