Question 539096
Equate the imaginary parts to get 5i = ai and solve for 'a' to get a = 5



Now equate the real parts to get a+b = 9 and plug in a = 5 to get 5+b = 9



From here, solve for b: 



5+b = 9



b = 9-5



b = 4



So the answer is b = 4



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