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6=18-4c
We move all terms to the left:
6-(18-4c)=0
We add all the numbers together, and all the variables
-(-4c+18)+6=0
We get rid of parentheses
4c-18+6=0
We add all the numbers together, and all the variables
4c-12=0
We move all terms containing c to the left, all other terms to the right
4c=12
c=12/4
c=3
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