3x+2(x-2.3)=12.9 x=?
问题描述:
3x+2(x-2.3)=12.9
x=?
答
3x+2(x-2.3)=12.9
3x+2x-4.6=12.9
5x=4.6+12.9
5x=17.5
x=3.5