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