1/2[x-1/2(x-1)]=2/3(x-1) 两边乘63(x-0.5x+0.5)=4(x-1)1.5x+1.5=4x-44x-1.5x=1.5+42.5x=5.5x=5.5÷2.5x=2.2
=5y+25y=-3-25y=-5