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Represent a girl pulls the crate with 5 units and another girl pulls the same unit in the same direction.

---> (5 units for the girl)
---> (5 units for another girl)

solving for the Net force
Net= Fn+Fg
= 5 units + 5 units
= 10 units

hence the result is not zero then the situation considered unbalanced force. the object will typically move.
2 5 2