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=3C+9+C-30
We move all terms to the left:
-(3C+9+C-30)=0
We add all the numbers together, and all the variables
-(4C-21)=0
We get rid of parentheses
-4C+21=0
We move all terms containing C to the left, all other terms to the right
-4C=-21
C=-21/-4
C=5+1/4
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