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D( x )
x^14 = 0
x^14 = 0
x^14 = 0
1*x^14 = 0 // : 1
x^14 = 0
x = 0
x in (-oo:0) U (0:+oo)
5/(x^14) = 0
5*x^-14 = 0 // : 5
x^-14 = 0
x należy do O
x belongs to the empty set
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