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2014-10-10T08:46:56+03:00
A-b=215
b-c=132
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a+b-b-c=215-132
a-c=83



a-c=138
b-c=129
----------
a-b+c-c=138-129
a-b=9

a-b=72
(a-c)-(b+c)=18
a-c-b-c=18
a-b-2c=18
72-2c=18
72-18=2c
54=2c
c=27

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