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39=7c-17
We move all terms to the left:
39-(7c-17)=0
We get rid of parentheses
-7c+17+39=0
We add all the numbers together, and all the variables
-7c+56=0
We move all terms containing c to the left, all other terms to the right
-7c=-56
c=-56/-7
c=+8
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