2(0.3X+4)-5(0.2X-7)=9 方程解

问题描述:

2(0.3X+4)-5(0.2X-7)=9 方程解

2(0.3X+4)-5(0.2X-7)=9
0.6x+8-x+35=9
0.4x=34
x=85