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[(a² - 9b²) : (a+b)²] : [(a+3b):(a+b)]=
[(a-3b)(a+3b) : (a+b)²] : [(a+3b):(a+b)]=
[(a-3b): (a+b)²] : [1:(a+b)]=
[(a-3b): (a+b)] : [1:1]=
[(a-3b): (a+b)] =
(a-3b):(a+b)