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2c+28=12c-42
We move all terms to the left:
2c+28-(12c-42)=0
We get rid of parentheses
2c-12c+42+28=0
We add all the numbers together, and all the variables
-10c+70=0
We move all terms containing c to the left, all other terms to the right
-10c=-70
c=-70/-10
c=+7
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