6. It is found that F~ 2 = 6ˆi − 7ˆjN, (3.7) and F~ 3 = 3ˆi 8ˆjN. (3.8) What is the magnitude of F~ 1 when F~ 1, F~ 2 and F~ 3 are in equilibrium according to Eq. (3.2)?

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