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-(9-3C)=-13
We move all terms to the left:
-(9-3C)-(-13)=0
We add all the numbers together, and all the variables
-(-3C+9)-(-13)=0
We add all the numbers together, and all the variables
-(-3C+9)+13=0
We get rid of parentheses
3C-9+13=0
We add all the numbers together, and all the variables
3C+4=0
We move all terms containing C to the left, all other terms to the right
3C=-4
C=-4/3
C=-1+1/3
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