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D( x )
x = 0
x^-5*y^-9*((20*x^2*y^9*z^-6)/12)*z^-3 = 0
x = 0
x = 0
x^-5*y^-9*((20*x^2*y^9*z^-6)/12)*z^-3 = 0
x^-5*y^-9*((20*x^2*y^9*z^-6)/12)*z^-3 = 0
5/3*x^-3*z^-9 = 0 // : 5/3*z^-9
x^-3 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(x^-5*y^-9*((20*x^2*y^9*z^-6)/12)*z^-3)^-1 = 0
3/5*x^3*z^9 = 0 // : 3/5*z^9
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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