Question

2m+m-8=7 with shown work​

Answer 1

Well since you are looking for m.
What you need to do is...
First: add common factors in this problem 2m and m will get you 3m
The second step would be to have 3m alone so what you do is you add 8 to both sides cancelling out the 8 with m giving you:
3m= 15
Next you divid both sides by the number that is used by m in this case 3
Giving you m=5

Answer 2

2m+m-8=7
Combine 2m+m
3m-8=7 add 8
3m=15 divide by 3
M=5