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D( x )
5*x^10 = 0
5*x^10 = 0
5*x^10 = 0
5*x^10 = 0 // : 5
x^10 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/(5*x^10) = 0
3/5*x^-9 = 0 // : 3/5
x^-9 = 0
x należy do O
x belongs to the empty set
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