3{2x-1-[3(2x-1)+3]}=9 2x-1-[3(2x-1)+3]=3 2x-[3(2x-1)+3]=4 2x-3(2x-1)-3=4 2x-3(2x-1)=7 2x-6x+3=7 -4x=-4 4x=4 x=1