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Find the acceleration of the masses shown, given that m1 = 1.0 kg, m2 = 2.0 kg and m3 = 3.0 kg

m1 and m2 are on a table top connected by a rope, m3 is hanging off of the table connected to m2 by a rope and a pully.

I have drawn free body diagrams for all of the masses, and have tried

T1 - W3 = - M3 A

T1 = (3)(9.8) - (3)(A)

I am unsure on how to find the tension, it is all that I need to find the acceleration.

Can someone point me in the right direction on how to find the tension?