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D( x )
x = 0
x^-3*y^2*z = 0
x^-7*y^2*z = 0
(x^-7*y^2*z)^-1 = 0
x = 0
x = 0
x^-3*y^2*z = 0
x^-3*y^2*z = 0
x^-3*y^2*z = 0 // : y^2*z
x^-3 = 0
x należy do O
x^-7*y^2*z = 0
x^-7*y^2*z = 0
x^-7*y^2*z = 0 // : y^2*z
x^-7 = 0
x należy do O
(x^-7*y^2*z)^-1 = 0
(x^-7*y^2*z)^-1 = 0
x^7*y^-2*z^-1 = 0 // : y^-2*z^-1
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-3*y^2*z)^-2)/((x^-7*y^2*z)^-1) = 0
x^-1*y^-2*z^-1 = 0 // : y^-2*z^-1
x^-1 = 0
x należy do O
x belongs to the empty set
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