(x+13)/(x+3+13)=6/7 解得x=5

题目

(x+13)/(x+3+13)=6/7 解得x=5

答案

(x+13)/(x+3+13)=6/7
(x+13)/(x+16)=6/7
交叉相乘：
7(x+13)=6(x+16)
7x+91=6x+96
移项：
7x-6x=96-91
x=5