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18c-16c+4c-2c-2c=18
We move all terms to the left:
18c-16c+4c-2c-2c-(18)=0
We add all the numbers together, and all the variables
2c-18=0
We move all terms containing c to the left, all other terms to the right
2c=18
c=18/2
c=9
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