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a+b+c=785

a+b=479

b+c=429




Răspuns :

a+b+c=785
a+b=479

479+c=785
c=785-479
c=306

b+c=429
b+306=429
b=429-306
b=123

a+b=479
a+123=479
a=479-123
a=356

Verificare
356+123+306=785