(x+20)/(x-20)=7/6
问题描述:
(x+20)/(x-20)=7/6
答
等号两边交叉相乘,6*(x+20)=7*(x-20)
化简,6x+120=7x-140
移项化简,6x-7x=-140-120
-x=-260
x=260