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a+b+c=8994
a+c=6987
a-c=987
a=? b=? c=?


Răspuns :

b+(a+c)=8994     b+6987=8994 b=8994-6987 = 2007  







b= 8994- 6987
b=2007
a-c= 987
a+c= 6987
6987-987=6000
6000: 2= 3000
c= 3000
a= 3000+ 987= 3987