Respuesta :
5 + 2m = 3 + m
- 2m - 2m
---------------------------
5 = 3 - m
-3 - 3
----------------------
2 = -m
----- ------
-1 -1
m = -2
- 2m - 2m
---------------------------
5 = 3 - m
-3 - 3
----------------------
2 = -m
----- ------
-1 -1
m = -2