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I drew a FBD about point A and came up with the two equations:

∑Fx=0 20sinθ - T-ab(cos70)=0

ΣFy =0 -20cosθ + T-ab(sin70) -20=0

My answer is not coming out so I either messed up on the FBD or the equations, some help would be appreciated. I'm on 3-10 by the way.