Look at example 1 You would see the difference between the values, the greater force would get the push in their direction. 3. 50 N left vs 40 N right 50N is greater which means the direction would be going left 50N - 40N = 10N Solution: 10N left
4. 30N left vs 100N right 100N is greater which means the direction would be going right 100N - 30N = 70N Solution: 70N right