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stiind ca 4a+6b-3=11 afla 6a+9b

Răspuns :

4a+6b-3=11

4a+6b=14

2a+3b=7  /*3

6a+9b=21

4a+6b-3=11|+3

4a+6b=14|:2

2a+3b=7|×3

6a+9b=21