Solve Atwood's Machine Problem: Acceleration of Weights

[claudio315]

Problem: There is this pulley, pulley A. On one end is another pulley, pulley B, and on the other end is a weight of mass X. On one end of pulley B is a weight of mass Y and on the other end is a weight of mass Z. How do you get the acceleration of the system? I mean the acceleration of the weights.

 

[arildno]

What have you done so far?