It seems the problem details are in an image that I can't view. Could you please type out the problem description (like equations, conditions, or what needs to be calculated) in text form? That way I can help you solve it step by step.

If you're referring to a common problem (e.g., finding a+b+c given pairwise sums), let's say:
Suppose (a+b=5), (b+c=7), (c+a=6). Then adding all three equations: (2(a+b+c)=18), so (a+b+c=9).

But please confirm the exact problem!

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