Finding the magnitude necessary to balance two forces

1. The problem statement, all variables and given/known data
Two forces are acting on an object. The magnitudes of them are F1=10.0N, F2=4.0N. If a third force F3 is applied on the object, what is the smallest magnitude of F3 needed to balance the first two forces?

2. Relevant equations

3. The attempt at a solution
I’ve done a lot of internet searching for this question and had no luck. With that being said, I am really starting from ground zero here (hence no equation). I’m guessing that this problem has to do with FNET and is probably easier than it looks? If someone could give me an equation to use I would probably be in good shape. Thank you!

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