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7c-1=5c+7
We move all terms to the left:
7c-1-(5c+7)=0
We get rid of parentheses
7c-5c-7-1=0
We add all the numbers together, and all the variables
2c-8=0
We move all terms containing c to the left, all other terms to the right
2c=8
c=8/2
c=4
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