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stiind ca 2a+b=79 2c+3b=99. află 4a+5b+2c

Răspuns :

2a+b=79 |*2
3b+2c=99

4a+2b=158
3b+2c=99
Le adunam

4a+2b+3b+2c=158+99
4a+5b+2c=257