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Daca 2a+3b=156 aflati 129+6b+4a.
Daca x+3y=576,aflati x+179+3y.
Aflati numerele de forma ab daca ab6+6ab=870


Răspuns :

2(2a+3b)=2x156
4a+6b=312
312+129=441

576+179=755

ab6+
6ab
___
870 =>b=4 si a=2