方程,x-(4/7x+ 90)=(3/14)x
问题描述:
方程,x-(4/7x+ 90)=(3/14)x
好了再给300财富值!
答
x-4/7x-90=3/14x
3/7x-3/14x=90
3/14x=90
x=30*14
x=420