3. $m$ is an integer not greater than 4, and the equation $x^{2}-2(2 m-3) - x+4 m^{2}-14 m+8=0$ has two integer roots. Find these two integer roots.
(Answer: $m=0$ 时, $x_{1}=-2, x_{2}=-4 ; m=4$ 时, $x_{1}$ $=2, x_{2}=8$ )

(Answer: $m=0$ when, $x_{1}=-2, x_{2}=-4 ; m=4$ when, $x_{1}$ $=2, x_{2}=8$ )