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-34=-3c-7
We move all terms to the left:
-34-(-3c-7)=0
We get rid of parentheses
3c+7-34=0
We add all the numbers together, and all the variables
3c-27=0
We move all terms containing c to the left, all other terms to the right
3c=27
c=27/3
c=9
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