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D( w )
8^2*8^-w = 0
8^2*8^-w = 0
8^2*8^-w = 0
8^2 = 0
64 = 0
w belongs to the empty set
8^-w = 0
w należy do O
8^2*8^-w = 0 <=> 8^2 = 0 or 8^2*8^-w = 0 <=> 8^-w = 0
w in (-oo:+oo)
(8^6*8^w)/(8^2*8^-w) = 0
(8^6*8^w)/(8^2*8^-w) = 0 // * 8^2*8^-w
8^6*8^w = 0
8^6 = 0
262144 = 0
w belongs to the empty set
8^w = 0
w należy do O
8^6*8^w = 0 <=> 8^6 = 0 or 8^6*8^w = 0 <=> 8^w = 0
w belongs to the empty set
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