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2014-05-03T20:19:33+03:00
(a+b)/2=90
(b+c)/2=99
(a+c)/2=93
a+b=180
b+c=198
a+c=186
a=180-b
c=198-b
180-b+198-b=186
378-2b=186
378-186=2b
2b=192
b=192/2=96
a=180-96=84
c=198-96=102
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