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s in (-oo:+oo)
0.85*(1/2)*18^s = 0
0.85*(1/2) = 0
0.425 = 0
s belongs to the empty set
18^s = 0
s naleu017Cy do O
0.85*(1/2)*18^s = 0 <=> 0.85*(1/2) = 0 or 0.85*(1/2)*18^s = 0 <=> 18^s = 0
s belongs to the empty set
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