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-3.9=3c-9
We move all terms to the left:
-3.9-(3c-9)=0
We get rid of parentheses
-3c+9-3.9=0
We add all the numbers together, and all the variables
-3c+5.1=0
We move all terms containing c to the left, all other terms to the right
-3c=-5.1
c=-5.1/-3
c=1+2.1/3
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