a+b+c=6493
b+c =4617
a=c- 213
inlocuim
c-213+4617=6493
c-213=6493-4617
c-213=1876
c=1876+213
c=2089
b+c=4617
b+2089=4617
b=4617-2089
b=2528
a+b+c=6493
a+2528+2089=6493
a+2528=6493-2089
a+2528=4404
a=4404-2528
a=1876
verificare
1876+2528+2089=4404+2089=6493
SPER CA TE-AM AJUTAT !!! :)