1/2{1/2【1/2(1/2x-1)-1】-1}=1
{1/2【1/2(1/2x-1)-1】-1}=2
1/2【1/2(1/2x-1)-1】=3
【1/2(1/2x-1)-1】=6
1/2(1/2x-1) =7
(1/2x-1) =14
1/2x =15
x =30
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