Respuesta :

6m-8=2+9m-1
-6m       -6m

-8=2+3m-1
-8=1+3m
-1=-1
-9=3m             m=-3
6m-8=2+9m-1
6m-8=1+9m
-8=1+9m-6m
-8=1+3m
3m+1=-8
3m=-8-1
3m=-9
m=-9/3
m=-3

The answer is -3. Hopefully it helped you.