25%x+5/2x+21=x

问题描述:

25%x+5/2x+21=x
怎么解

5/2是5分之2吗?假如是那么
25%x+5/2x+21=x
0.4x+0.4x+21=x
x-0.4x-0.4x=21
0.2x=21
x=21/0.2
x=105