Three boxes 1= 3.1 kg, 2=8.4 kg, and 3=5.0 kg are attached by an ideal rope and pulley system, as shown. The coefficients of kinetic and static friction between 2 and the surface are =0.3 and =0.4 , respectively. The system is in equilbrium with all the boxes stationary. What is the magnitude of the force of friction acting on the box?

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