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2014-11-03T14:02:53+02:00
A+b+c=3096
a+b=2179
b+c=2721
2179+c=3096
c=3096-2179
c=917
a+2721=3096
a=3096-2721
a=375
375+b=2179
b=2179-375
b=1804
P: 375+1804+917=3096