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Stiind ca A plus B = 14 si B plus C =9 calculati 3A plus 5B plus 2C

Răspuns :

A+B=14
B+C=9
(le adunam)
2B+A+C=23|•2
4B+2A+2C=46 (o adunam cu A+B)
5B+3A+2C=60