2(0.3x+4)-5(0.2x-7)=9怎么做

问题描述:

2(0.3x+4)-5(0.2x-7)=9怎么做

2(0.3x+4)-5(0.2x-7)=9
0.6x+8-x+35=9
-0.4x=9-43
-0.4x=-34
x=85