Answer:
11m-3
Explanation:
First, rearrange the problem to where all the variables are next to each other
12m-m-17+14
Then, you subtract -m from 12m
11m-17+14
Now, add 14 to -17
11m-3
If you're supposed to set the expression to equal zero, lemme know and I'll edit my answer, hope this helps though :D