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6(2c-6)=72
We move all terms to the left:
6(2c-6)-(72)=0
We multiply parentheses
12c-36-72=0
We add all the numbers together, and all the variables
12c-108=0
We move all terms containing c to the left, all other terms to the right
12c=108
c=108/12
c=9
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