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12c-4c-9=9c+5
We move all terms to the left:
12c-4c-9-(9c+5)=0
We add all the numbers together, and all the variables
8c-(9c+5)-9=0
We get rid of parentheses
8c-9c-5-9=0
We add all the numbers together, and all the variables
-1c-14=0
We move all terms containing c to the left, all other terms to the right
-c=14
c=14/-1
c=-14
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