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x in (-oo:+oo)
(1/2)*9^x = 0
1/2 = 0
1/2 = 0 // * 2
1 = 0
9^x = 0
x należy do O
(1/2)*9^x = 0 <=> 1/2 = 0 or (1/2)*9^x = 0 <=> 9^x = 0
x belongs to the empty set
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