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12c-9=2c+11
We move all terms to the left:
12c-9-(2c+11)=0
We get rid of parentheses
12c-2c-11-9=0
We add all the numbers together, and all the variables
10c-20=0
We move all terms containing c to the left, all other terms to the right
10c=20
c=20/10
c=2
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