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Statics - slopes, pulleys and weights

Hi Guys, got the following diagram but need to know how I can relate forces in terms of a coordinate system chosen so that I can express the magnitude of each weight in terms of its mas and g.

Note, the system is in equilibrium and m>2Msin(alpha) and the particle A is on the point of slipping up the slope.

Also, how can I use the conditions for equilibrium, together with the propoerties of a model pulley to find the scalar equations relating to the magnitudes of forces?

Finally, does anyone know what the co-efficient of static friction between particle A and the plane looks like?