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D( x )
75*x^13*y^12*z = 0
75*x^13*y^12*z = 0
75*x^13*y^12*z = 0
75*x^13*y^12*z = 0 // : 75*y^12*z
x^13 = 0
x = 0
x in (-oo:0) U (0:+oo)
((25*x^5*y^-4*z^-9)/(75*x^13*y^12*z))^2 = 0
1/9*x^-16*y^-32*z^-20 = 0 // : 1/9*y^-32*z^-20
x^-16 = 0
x należy do O
x belongs to the empty set
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