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9c^2-49c=9c^2+12c
We move all terms to the left:
9c^2-49c-(9c^2+12c)=0
We get rid of parentheses
9c^2-9c^2-49c-12c=0
We add all the numbers together, and all the variables
-61c=0
c=0/-61
c=0
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