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2c-4=7c-39
We move all terms to the left:
2c-4-(7c-39)=0
We get rid of parentheses
2c-7c+39-4=0
We add all the numbers together, and all the variables
-5c+35=0
We move all terms containing c to the left, all other terms to the right
-5c=-35
c=-35/-5
c=+7
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