Răspuns :
abc5-5abc = 2871
10*abc+5-(5000+abc)=2871
10*abc+5-5000-abc=2871
9*abc+5-5000=2871
9*abc+5=7871
9*abc=7866
abc=874
10*abc+5-(5000+abc)=2871
10*abc+5-5000-abc=2871
9*abc+5-5000=2871
9*abc+5=7871
9*abc=7866
abc=874
abc5-5abc=2871
abc5=abc*10+5
5abc=5000+abc
abc5=2871+5abc
abc10+5=2871+5000+abc
9abc+5=7871
9abc=7866| 9
abc=874
nr.este 8745
abc5=abc*10+5
5abc=5000+abc
abc5=2871+5abc
abc10+5=2871+5000+abc
9abc+5=7871
9abc=7866| 9
abc=874
nr.este 8745