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