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Daca: a+b+c=198 b-c=123 atunci: 2a+b+3c+?

Răspuns :

2(a+b+c)-(b-c)=2x198-123 2(a+b+c)-b+c=396-123 2a+2b+2c-b+c=273 2a+b+3c=273