解：4x+2(x-1)=4 4x+2x-2 =4 6x-2+2 =4+2 6x =6 x=1
4x+2(x-1)=44x+2x-2=44x+2x=4+26x=6x=6÷6x=1
4x+2(x-1)=44x+2x-2=46x=6x=1
4x+2x-2=4得6x=6得x=1。
