\(\Delta=9-4\left(2-m\right)=4m+1\ge0\Rightarrow m\ge-\frac{1}{4}\)
\(x_1\left(1-2x_2\right)+x_2\left(1-2x_1\right)=2m\)
\(\Leftrightarrow x_1+x_2-4x_1x_2=2m\)
\(\Leftrightarrow3-4\left(2-m\right)=2m\)
\(\Leftrightarrow2m=3\Rightarrow m=\frac{3}{2}\left(t/m\right)\)