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2014-08-04T14:25:17+03:00
A+b+c=87

a+23=b+21=c+4

a+23=b+21
a=b+21-23
a=b-2

b+21=c+4
c=b+21-4
c=b+17

b-2+b+b+17=87
3b+15=87

3b=87-15
3b=72
b=24

a=24-2=22
c=24+17=41
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