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2014-03-17T12:14:55+02:00
 a+b+c=6000       
a+b=4468

4468+c=6000
c=6000-4468
c=1532

a+b+c=6000      
b+c=2785
a+2785=6000
a=6000-2785
a=3215

3215+b=4468
b=4468-3215
b=1253