(2m-1)x-(m+3)y-m+11=0
2mx-x-my-3y-m+11=0
m(2x-y-1)-x-3y+11=0
2x-y-1=0(1)
-x-3y+11=0
x+3y-11=0
2x+6y-22=0
7y-11=0
y=11/7
x=11-3y=11-33/7=44/7
x=44/7,y=11/7
恒过定点.(44/7,11/7)