Three forces are applied to an object. Force F1 has a magnitude of 20.9 N and is directed 30.0 degrees to the left of the +Y axis. Force F2 has a magnitude of 15.5 N and points along the +x axis. What must be the magnitude and direction (specified by the angle theta in the attached image) of the third force F3 such that the vector sun of three forces is 0 N?

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