1/2(1/3(1/4(1/5x-1)-6)+4)=1
(1/3(1/4(1/5x-1)-6)+4)=2
1/3(1/4(1/5x-1)-6)=-2
1/4(1/5x-1)-6=-6
1/4(1/5x-1)=0
1/5x-1=0
1/5x=1
x=5