1/2{1/2[1/2(1/2x-3)-3]-3}-3=0
1/2[1/2(1/2x-3)-3]-3-6=0
1/2[1/2(1/2x-3)-3]-9=0
1/2(1/2x-3)-3-18=0
1/2(1/2x-3)-21=0
1/2x-3-42=0
1/2x-45=0
1/2x=45
x=90
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1/2{1/2[1/2(1/2x-3)-3]-3}-3=0
1/2{1/2[1/4x-3/2-3]-3}-3=0
1/2{1/8x-3/4-3/2-3}-3=0
1/16x-3/8-3/4-3/2-3=0
x-6-12-24-48
x=6+12+24+48=90
1/2{1/2[1/2(1/2x-3)-3]-3}-3=0
X=90