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The net force of the system is the sum of the individual forces. In this case, we have:
Cue ball force = -70 N (to the left)
Four ball force = 50 N (to the right)
To find the net force, we simply add these two forces together:
Net force = -70 N + 50 N
Net force = -20 N
Therefore, the net force of this system is -20 N.