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7c-9=2c+1
We move all terms to the left:
7c-9-(2c+1)=0
We get rid of parentheses
7c-2c-1-9=0
We add all the numbers together, and all the variables
5c-10=0
We move all terms containing c to the left, all other terms to the right
5c=10
c=10/5
c=2
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