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D( x )
x = 0
x^-4 = 0
x = 0
x = 0
x^-4 = 0
x^-4 = 0
1*x^-4 = 0 // : 1
x^-4 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
y^0*z^0*((3*x^3*y^-1*z^-1)/(x^-4)) = 0
(3*x^3*y^-1*z^-1)/(x^-4) = 0
3*x^7*y^-1*z^-1 = 0 // : 3*y^-1*z^-1
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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