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The answer will depend on what Region A and Region B are. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
b + 4 = 7.7 b = 7.7 - 4 b = 3.7
3b+4 = b+12 3b-b = 12-4 2b = 8 b = 4
It is difficult to answer the question because it is still ambiguous. Putting brackets in helps. So: (3 over 4) x b = 3/4*b = 3*b / 4 YES but 3 over (4 x b) = 3/(4*b) is not 3/4*b
(b + 4)(b + 4)