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2014-11-03T16:53:47+02:00
B+(a+c)=8994     b+6987=8994 b=8994-6987 = 2007  







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2014-11-03T16:55:29+02:00
B= 8994- 6987
b=2007
a-c= 987
a+c= 6987
6987-987=6000
6000: 2= 3000
c= 3000
a= 3000+ 987= 3987
2 5 2