n-2+n+n+2=123,n等于多少
问题描述：
n-2+n+n+2=123,n等于多少
答
n-2+n+n+2=123
3n=123
n=41
n-2+n+n+2=123,n等于多少
n-2+n+n+2=123
3n=123
n=41