(x-5)×7/9=3x/5+5

问题描述:

(x-5)×7/9=3x/5+5

球Q珊珊,
(x-5)×7/9=3x/5+5
7x/9-35/9=3x/5+5
7x/9-3x/5=5+35/9
35x-27x=225+175
8x=400
x=50