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