What is the Acceleration of the System?

[swimstar]

There is friction between the block and the table.
The suspended 4 kg mass on the left is moving up, the 2 kg mass slides to the right on the table, and the suspended mass 7 kg on the right is moving down. The acceleration of gravity is 9.8 m/s/s. What is the magnitude of the acceleration of the system? Answer in units of m/s/s.


(the picture won't work)
the µ = 0.16.

 

[kuruman]

Please observe the rules of this forum and use the template to seek homework help. Tell us what you know and what your thoughts are about solving this problem. In this specific case, a picture or at least a description of what is going on will keep us from guessing. Otherwise there might be confusion on both sides.