2(0.9-x)+4=4.3 怎么解
问题描述：
2(0.9-x)+4=4.3 怎么解
答
2(0.9-x)+4=4.3
2(0.9-x)=4.3-4
2(0.9-x)=0.3
0.9-x=0.3/2
0.9-x=0.15
0.9-0.15=x
x=0.75