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2014-08-04T14:37:36+03:00
D:I=C ,+R
R <I

D+I+C=71
D=56

I=C+1

56+C+1+C=71

57+2C=71

2C=71-57

2C=14
C=14:2=7

I=C+1=7+1=8


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