x-12=0.25x
问题描述：
x-12=0.25x
答
x-12=0.25x
x-0.25x=12
0.75x=12
x=12/0.75=16
x-12=0.25x
x-12=0.25x
x-0.25x=12
0.75x=12
x=12/0.75=16