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-4c-12=4c+21
We move all terms to the left:
-4c-12-(4c+21)=0
We get rid of parentheses
-4c-4c-21-12=0
We add all the numbers together, and all the variables
-8c-33=0
We move all terms containing c to the left, all other terms to the right
-8c=33
c=33/-8
c=-4+1/8
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