2x-[x-(x-1)/2]/2=(x-1)/3
2x-(x-x/2+1/2)/2=(x-1)/3
12x-3(x/2+1/2)=2(x-1)
12x-3x/2-3/2=2x-2
12x-3x/2-2x=3/2-2
17x/2=-1/2
x=-1/17
2x-[x-(x-1)/2]/2=(x-1)/3
2x-(x-x/2+1/2)/2=(x-1)/3
12x-3(x/2+1/2)=2(x-1)
12x-3x/2-3/2=2x-2
12x-3x/2-2x=3/2-2
17x/2=-1/2
x=-1/17