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COROANA ! 2a+b =7 aflati 4a+1+2b

Răspuns :

 4a+2b+1 <=> 2(2a+b)+1 <=> 2*7+1=14+1=15
2a+b=7 | x2
4a+2b=14

==> 4a+1+2b inlocuim 4a+2b in relatie

==>14+1=15