Okay so your equation would be 0-4-4+14-5
We would start at 0 since its the beginning, then subtract 4 yards for the first play, another 4 for the second, add 14 to the third, and subtract 5 for the fourth
So with 0-4-4+15-5, we would add and subtract left to right so it would be
-8+14-5 yards
6-5 yards
1 yard.
Hope this helped