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-3=18-3c
We move all terms to the left:
-3-(18-3c)=0
We add all the numbers together, and all the variables
-(-3c+18)-3=0
We get rid of parentheses
3c-18-3=0
We add all the numbers together, and all the variables
3c-21=0
We move all terms containing c to the left, all other terms to the right
3c=21
c=21/3
c=7
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