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21=3c-24+c
We move all terms to the left:
21-(3c-24+c)=0
We add all the numbers together, and all the variables
-(4c-24)+21=0
We get rid of parentheses
-4c+24+21=0
We add all the numbers together, and all the variables
-4c+45=0
We move all terms containing c to the left, all other terms to the right
-4c=-45
c=-45/-4
c=11+1/4
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