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x in (-oo:+oo)
(4/5)*16^x = 0
4/5 = 0
4/5 = 0 // * 5
4 = 0
16^x = 0
x należy do O
(4/5)*16^x = 0 <=> 4/5 = 0 or (4/5)*16^x = 0 <=> 16^x = 0
x belongs to the empty set
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