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D( x )
x^5*((z^1)/4) = 0
x^5*((z^1)/4) = 0
x^5*((z^1)/4) = 0
x^5*(z/4) = 0
1/4*x^5*z = 0 // : 1/4*z
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^5*((z^1)/4))^-3)/2 = 0
((x^5*(z/4))^-3)/2 = 0
32*x^-15*z^-3 = 0 // : 32*z^-3
x^-15 = 0
x należy do O
x belongs to the empty set
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