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