(3m+2n)x+3m=5x+n+1
(3m+2n)x-5x=n+1-3m
(3m+2n-5)x=n+1-3m
即方程无数解
所以3m+2n-5=0 (1)
n+1-3m=0 (1)
(1)+(2)
3n-4=0
n=4/3
m=(5-2n)/3=7/9