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3+15=c-9
We move all terms to the left:
3+15-(c-9)=0
We add all the numbers together, and all the variables
-(c-9)+18=0
We get rid of parentheses
-c+9+18=0
We add all the numbers together, and all the variables
-1c+27=0
We move all terms containing c to the left, all other terms to the right
-c=-27
c=-27/-1
c=+27
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