6X-2(18-X)=606X-36+2X=606X+2X=60+368X=96X=96÷8X=12 不懂可追问,有帮助请采纳,谢谢!
6X-2(18-X)=60方程2边同除以23X-(18-X)=303X-18+X=304X=30+18=48X=12
6x-36+2x=606x+2x=60+368x=96x=12
6X-2(18-X)=606X-36+2X=608X=96X=12
12