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Calculati 7a+5b+3c stiind ca 2a+b-3c=24 si a+b+3c=108

Răspuns :

7a+5b+3c=3·(a+b+3c)+2·(2a+b-3c)
7a+5b+3c=3·108+2·24
7a+5b+3c=324+48
7a+5b+3c=372