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D( x )
4^x = 0
4^x = 0
4^x = 0
x naleu017Cy do O
x in (-oo:+oo)
(80*8^x)/(4^x) = 0
(80*8^x)/(4^x) = 0 // * 4^x
80*8^x = 0
8^x = 0
x naleu017Cy do O
80*8^x = 0 <=> 80 = 0 or 80*8^x = 0 <=> 8^x = 0
x belongs to the empty set
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