Question 990568
Assuming that you are solving for m, this is what you should do.

-7+10=m-5   
first, you simplify the left side of the equation
3=m-5   
then you add five to both sides of the equation
8=m    

The answer is m=8

CHECK: 
plug in 8 as m
-7+10=8-5
3=8-5
3=3