(X-124)/(y-11)=4/9x等于多少

问题描述:

(X-124)/(y-11)=4/9x等于多少

(x-124)/(x-11)=4/9
4(x-11)=9(x-124)
2x-44=9x-1116
-7x=-1072
x=1072/7