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66=c/3+57
We move all terms to the left:
66-(c/3+57)=0
We get rid of parentheses
-c/3-57+66=0
We multiply all the terms by the denominator
-c-57*3+66*3=0
We add all the numbers together, and all the variables
-1c+27=0
We move all terms containing c to the left, all other terms to the right
-c=-27
c=-27/-1
c=+27
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