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21=4c+24
We move all terms to the left:
21-(4c+24)=0
We get rid of parentheses
-4c-24+21=0
We add all the numbers together, and all the variables
-4c-3=0
We move all terms containing c to the left, all other terms to the right
-4c=3
c=3/-4
c=-3/4
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