3.6x+3.6(x-15)=486
问题描述：
3.6x+3.6(x-15)=486
列方程
急急积急经纪
答
3.6x+3.6(x-15)=486
3.6x+3.6x-54=486
7.2x=486+54
7.2x=540
x=540÷7.2
x=75