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t in (-oo:+oo)
(168*2^-t)/5 = 0
(168*2^-t)/5 = 0 // * 5
168*2^-t = 0
2^-t = 0
t należy do O
168*2^-t = 0 <=> 168 = 0 or 168*2^-t = 0 <=> 2^-t = 0
t belongs to the empty set
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