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D( x )
0.2^x = 0
0.2^x = 0
0.2^x = 0
x należy do O
x in (-oo:+oo)
(0.05^x)/(0.2^x) = 0
(0.05^x)/(0.2^x) = 0 // * 0.2^x
0.05^x = 0
x należy do O
x belongs to the empty set
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