so, to do this, you need to isolate the variable (which is -m in this case). To do that, you need to put the variable on one side, and the number on the other.
so we have, 10=7-m...
we need the -m on one side of the equal sign, and the other number on the other.
to do that, we need to subtract 7 from both sides to get the -m alone on the right side of the equal sign.
10-7= 7-m-7 whenever you want to change something to one side of the equal sign, you need to do it to the other (i.g. subtracting 7 from both sides)
then we get, 3=-m
we want the answer for m, not -m. if -m is equal to 3, it would make sense if m is equal to -3. Which it is. so...
m=3
(:
