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a+b+c=198
b-c=123
2a+b+3c=?


Răspuns :

b-c=123→b=123+c

2(a+b+c)=396
2a+2b+2c=396
2a+b+123+c+2c=396
2a+b+123+3c=396
2a+b+3c=396-123
2a+b+3c=273
Succes!! :*