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3c+9=-3c-9
We move all terms to the left:
3c+9-(-3c-9)=0
We get rid of parentheses
3c+3c+9+9=0
We add all the numbers together, and all the variables
6c+18=0
We move all terms containing c to the left, all other terms to the right
6c=-18
c=-18/6
c=-3
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