13=2m + 5
8 = 2m
m = 4
EXPLANATION:
we have to break the equation down to find m. so, first, we take care of the 5. you can subtract 5 from the right side and what you do to the right, you have to do to the left.
this gives you 8 = 2m
next, we have to get rid of the 2 in order to only have an m. this means we have to divide m and 2. and remember, what you do to one side, you have to do to the other.
so, you do 2m divided by 2, giving you m and 8 divided by 2 giving you m = 4!!
hope that helped :)