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D( x )
3*x^3*z^2 = 0
8*z^2 = 0
3*x^3*z^2 = 0
3*x^3*z^2 = 0
3*x^3*z^2 = 0 // : 3*z^2
x^3 = 0
x = 0
8*z^2 = 0
8*z^2 = 0
8*z^2 = 0
x należy do R
x belongs to the empty set
(1*x^3*((5*x^5*z^6)/(8*z^2)))/(3*x^3*z^2) = 0
x belongs to the empty set
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