The solution to this problem is m = 1.
In order to solve any algebraic equation, we must get the letter we are looking for by itself, so that the equation reads "m = [value]".
In this case, to get m by itself, we must first get all of the terms that include m on the same side so we can collect the like terms and simplify.
This means subtracting m from both sides of the equation, so we get:
2m = 1 + m
- m
m = 1
I hope this helps!