3(x-2)=12去括号得 3x-6=12移项、合并得 3x=18系数化一得 x=6
3(X-2)=12解方程x-2 = 4x = 6
3(x-2)+12解:x-2=4x=6所以原方程解为x=6
3(X-2)=12x-2=4x=4+2x=6
啊??3(X-2)=12x-2=4x=4+2x=6