Which expressions are equivalent to 6k+5m+3n?

5m + (6k+3n)

3 (2k+n) + 5m

none of the above

6K+5M+3N

Let's work with the answers first to see if any of these will match our current expression.

5m + (6k + 3n). This does not work because these will forever have parenthesis, which our regular expression does not have.

3 (2k+n) + 5m. Distribute - - 6K+3N+5M. This works!