John and Leah want to move the piano in their living room. John pushes from behind the piano with a force of 300\text{ N}300 N300, start text, space, N, end text, and Leah pulls on a rope tied to the front with a force of 100\text{ N}100 N100, start text, space, N, end text. The piano has a mass of 200\text{ kg}200 kg200, start text, space, k, g, end text, and the friction force of the floor and the piano is 140\text{ N}140 N140, start text, space, N, end text. Calculate the acceleration of the piano.