m/2×（x+n）=1/3×(x+m)
问题描述：
m/2×（x+n）=1/3×(x+m)
(只要求出x的值即可,
答
mx/2+mn/2=x/3+m/3
(3m-2)x/6=(2m-3mn)/6
x=(2-3n)m/(3m-2)