10/3(x-5/2)-[4/3(2-7x/2)-5/3(3x+6)]=0 两边乘3
10(x-2.5)-4(2-3.5x)+5(3x+6)=0
10x-25-8+14x+15x+30=0
39x-3=0
39x=3
x=1/13