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39=9c+3
We move all terms to the left:
39-(9c+3)=0
We get rid of parentheses
-9c-3+39=0
We add all the numbers together, and all the variables
-9c+36=0
We move all terms containing c to the left, all other terms to the right
-9c=-36
c=-36/-9
c=+4
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