(3-2x)/(x-3)+(2-mx)/(3-x)=-1
(3-2x)-(2-mx)=-(x-3)
(m-2)x+1=3-x
(m-1)x=2
m=1时,方程无解
x-3=0,增根是3
代人(m-1)x=2得：m=5/3
所以,m=1,或,5/3时,方程无解