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(1/6)*(2/5)^x = 0
1/6 = 0
1/6 = 0 // * 6
1 = 0
(2/5)^x = 0
x należy do O
(1/6)*(2/5)^x = 0 <=> 1/6 = 0 or (1/6)*(2/5)^x = 0 <=> (2/5)^x = 0
x belongs to the empty set
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