3x+2(x-2.3)=12.9 x=?

问题描述:

3x+2(x-2.3)=12.9
x=?

3x+2(x-2.3)=12.9
3x+2x-4.6=12.9
5x=4.6+12.9
5x=17.5
x=3.5