X-(4/7X+90)=3/14X怎么解?
问题描述:
X-(4/7X+90)=3/14X怎么解?
答
X-4/7X-90=3/14X
3/7X-90=3/14X
3/7X-3/14X=90
3/14X=90
X=90*14/3
x=420