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D( x )
x^20 = 0
x^20 = 0
x^20 = 0
1*x^20 = 0 // : 1
x^20 = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/(x^20))/5 = 0
4/5*x^-20 = 0 // : 4/5
x^-20 = 0
x należy do O
x belongs to the empty set
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