1. solution using three variables

what is the answer to n=m+x I need to know what the value of m is.

what is the answer to n=m+x I need to know what the value of m is.
If $n = m + x$ then $m = n - x$.

If I had known how to work a problem I would not have come on this forum to ask how it was done. I do not appreciate being called stupid. The only stupid question is one that is not asked.