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2c=4c-18
We move all terms to the left:
2c-(4c-18)=0
We get rid of parentheses
2c-4c+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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