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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((V*x^-4)/10)*z^-9 = 0
1/10*V*x^-4*z^-9 = 0 // : 1/10*V*z^-9
x^-4 = 0
x należy do O
x belongs to the empty set
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