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Using the average values provided in TEK 14-1B, Table 3a for 8" walls grouted at 48" o.c., I = 351.7 in^3 and A = 49.6 in^2 which gives an r = 2.66 in.

Sum the moments about the base in order to get the reactions.  for clarity, let's call the top right joint point E. To determine the force in the brace member, analyze the joint at point A (lower left hand corner or the braced frame).  Sum the moments in the x direction and you will get...