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3(2c-3)=9
We move all terms to the left:
3(2c-3)-(9)=0
We multiply parentheses
6c-9-9=0
We add all the numbers together, and all the variables
6c-18=0
We move all terms containing c to the left, all other terms to the right
6c=18
c=18/6
c=3
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