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4c+9=c+18
We move all terms to the left:
4c+9-(c+18)=0
We get rid of parentheses
4c-c-18+9=0
We add all the numbers together, and all the variables
3c-9=0
We move all terms containing c to the left, all other terms to the right
3c=9
c=9/3
c=3
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