How would you solve the following problem:
m-(m+4n)-3n
What you have written is not an equation. All you can do is simplify it, not "solve" it.
The second step would be to restate it as
-4n -3n.
Can you guess the third and final step?
m-(m+4n)-3n
The second step would be to restate it as
-4n -3n.
Can you guess the third and final step?