Step-by-step explanation:
Get n by itself. It doesn't matter how you do it, you'll get the same answer whether you subtract m or add n to the other side. You just need to have a positive n by itself on one side of the equation.
[tex]a=m-n\\n+a=m\\n=m-a[/tex]
Answer:
B. [tex]n=m-a[/tex]
