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12.6=3c-9
We move all terms to the left:
12.6-(3c-9)=0
We get rid of parentheses
-3c+9+12.6=0
We add all the numbers together, and all the variables
-3c+21.6=0
We move all terms containing c to the left, all other terms to the right
-3c=-21.6
c=-21.6/-3
c=7+0.6/3
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