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a+b+c=6999a+b=3574b+c=5768

Răspuns :

c = 6999 - 3574
c = 3425
a = 6999 - 5769
a = 1230
b = 6999 - 3425 - 1230
b = 2344

69999-a+b=3425

6999-b+c=1231

6999-3425-1231=2343