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2014-04-28T23:32:51+03:00
A+b+c=1012
b=40+a/2
c=3a
a+40+a/2+3a=1012
(2a+a+6a/2=1012-40
9a/2=972
a=972·2/9
a=216
b=40+216/2
b=148
c=3·216
c=648