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x in (-oo:+oo)
20000*(1/2)^x = 0
(1/2)^x = 0
x naleu017Cy do O
20000*(1/2)^x = 0 <=> 20000 = 0 or 20000*(1/2)^x = 0 <=> (1/2)^x = 0
x belongs to the empty set
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