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a+c=7 ⇒ c=7-a
b+c=5
a+b=9
b+7-a=5
a+b=9
-a+b=-2
----------- +
2b=7
2a=18-7
2a=11
2c=14-11=3
Odp. Srednice tych okregow maja dlugosci: 3, 7, 11.