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20c+6=18c-18
We move all terms to the left:
20c+6-(18c-18)=0
We get rid of parentheses
20c-18c+18+6=0
We add all the numbers together, and all the variables
2c+24=0
We move all terms containing c to the left, all other terms to the right
2c=-24
c=-24/2
c=-12
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