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2a+b=?, stiind ca 6a+3b+1=19

Răspuns :

6a+3b+1=19
6a+3b=18
3(2a+b)=18
2a+b=18/3
2a+b=6
6a+3b+1=19
3×(2a+b)+1=19
3×(2a+b)=19-1
3×(2a+b)=18
2a+b=18:3
2a+b=6