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-9+3c=9+c
We move all terms to the left:
-9+3c-(9+c)=0
We add all the numbers together, and all the variables
3c-(c+9)-9=0
We get rid of parentheses
3c-c-9-9=0
We add all the numbers together, and all the variables
2c-18=0
We move all terms containing c to the left, all other terms to the right
2c=18
c=18/2
c=9
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