Answer :

naǫ
[tex]8c=5c+21 \ \ \ |\hbox{subtract 5c from both sides} \\ 3c=21 \ \ \ |\hbox{divide both sides by 3} \\ c=7[/tex]
first subtract 5c from 8c to get "3c=21" and divide each side by 3 so the answer is c=7

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