Balanced and Unbalanced Forces

These two pictures demonstrate a balanced and unbalanced force while pulling a rope. In the image on top, there is a balanced force because there is an equal amount (300N and 300N) of pulling force from each side. On the other hand, the picture on the bottom is an unbalanced force because in one side there are 400N of force to the left and 300N of force to the right, if this was tu be subtracted we would be left with 100N more force to the left. Whig makes it unbalanced.