七年级上册数学解方程
3(y+1)2(x-2)-3(3x+2)=x+63(x-7)-2[9-4(2-x)]=22x-1/3[x-1/3(x-9)]=1/9(x-9)
3(y+1)=(2y-1)2x-5=714x-3(20-x)=5x-3(8-x)