datele:
prima bucata=a
a doua bucata=b
a treia bucata=c
a+b+c=7998
a+b=5750
b+c=4958
-----------------
a,b,c=?
-----------------
a+b+c=7998
5750+c=7998
c=7998-5750
c=2248
a+b+c=7998
a+4958=7998
a=7998-4958
a=3040
a+b+c=7998
3040+b+2248=7998
3040+b=7998-2248
3049+b=5750
b=5750-3049
b=2701
SPER CA TE-AM AJUTAT!:D