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7(c+9)=9c+63
We move all terms to the left:
7(c+9)-(9c+63)=0
We multiply parentheses
7c-(9c+63)+63=0
We get rid of parentheses
7c-9c-63+63=0
We add all the numbers together, and all the variables
-2c=0
c=0/-2
c=0
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