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Calculati 5a+7b+cdaca 4a+7b=840 si a+c=120
Ajutatima va rog


Răspuns :

[tex]4a+7b=840 \\ a+c=120 \\ 5a+7b+c=? \\ 5a+7b+c=4a+7b+a+c=840+120=960 \\ \boxed{5a+7b+c=960}[/tex]