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-4c+28=21+3c
We move all terms to the left:
-4c+28-(21+3c)=0
We add all the numbers together, and all the variables
-4c-(3c+21)+28=0
We get rid of parentheses
-4c-3c-21+28=0
We add all the numbers together, and all the variables
-7c+7=0
We move all terms containing c to the left, all other terms to the right
-7c=-7
c=-7/-7
c=1
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