1-1/3(x-1+x/3)=1/2x-1/2(2x-10-7x/3)
6-2(x-1+x/3)=3x-3(2x-10-7x/3)
6-2x+2-2x/3=3x-6x+30+7x
18-6x+6-2x=9x-18x+90+21x
18+6-90=9x-18x+21x+6x+2x
66=20x
x=3.3
拜托了,任务!