A mass (M2 = 8.00 kg) is pulled by a force Fx to the left, and to the right it is pulled by the tension of a rope that passes through a pulley at the edge of a table and is tied to another mass (M1 = 2.00 kg). Use the coordinate system shown in the figure as a reference. Consider that there is no friction and the rope is an ideal rope. For what magnitude of Fx does the system have an acceleration equal to 0 m/s^2?