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D( x )
9^y = 0
9^y = 0
9^y = 0
x należy do O
x in (-oo:+oo)
(9^x)/(9^y) = 0
(9^x)/(9^y) = 0 // * 9^y
9^x = 0
x należy do O
x belongs to the empty set
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