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D( x )
((2*x^-3*y)/(3^-1))*z^4 = 0
x = 0
((2*x^-3*y)/(3^-1))*z^4 = 0
((2*x^-3*y)/(3^-1))*z^4 = 0
6*x^-3*y*z^4 = 0 // : 6*y*z^4
x^-3 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((2*x^-3*y)/(3^-1))*z^4)^-4 = 0
1/1296*x^12*y^-4*z^-16 = 0 // : 1/1296*y^-4*z^-16
x^12 = 0
x = 0
x in { 0}
x belongs to the empty set
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