The suspended 2.8 kg mass on the right is moving up on a pulley, the 1.6 kg mass slides down the 21 degree ramp, and the suspended 9 kg mass on the left is moving down on a pulley. The coefficient of friction between the block and the ramp is 0.12. The acceleration of gravity is 9.8 m/s^2. The pulleys are massless and frictionless. What is the acceleration of the three block system?