7x-1/24=1-2x/48-5x+1/12乘以48得2(7x-1)=1-2x-4(5x+1)14x-2=1-2x-20x-414x+22x=-3+236x=-1x=-1/362{2-【2-(2-x)】}=x4-2【2-(2-x)】=x4-4+2(2-x)=x4-2x=x4=2x+x3x=4x=4/3