Three forces are acting on a box of mass 5 kg. The first force has a magnitude of 10 N and is directed along the positive x-direction. The second force has a magnitude of 18 N and is directed at an angle of 20 degrees with respect to the positive x-axis. The third force has a magnitude of 7 N and is directed at an angle of 120 degrees with respect to the positive x-axis. What is the net acceleration of the box in the x-direction?

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