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D( x )
-3*y^2*z^5 = 0
-3*y^2*z^5 = 0
-3*y^2*z^5 = 0
-3*y^2*z^5 = 0
x należy do R
x belongs to the empty set
(20*y^2*z^5-(27*y*z^3))/(-3*y^2*z^5) = 0
x belongs to the empty set
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