Three point charges are located along the x axis: q1 = + 6.0  C at x1 = +4.0 cm, q2 = + 8.0  C at x2 = −5.0 cm, and q3 = −3.0  C at x2 = + 1.0 cm. The mass of the –3.0 μC charge is 4.0 × 10–9 kg. Determine the magnitude and direction of the acceleration of the –3.0 μC charge when it is allowed to move if the other two charges remain fixed. Show all step-by-step work (drawing, reasoning, solution with explanation).