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20.2=4c-9
We move all terms to the left:
20.2-(4c-9)=0
We get rid of parentheses
-4c+9+20.2=0
We add all the numbers together, and all the variables
-4c+29.2=0
We move all terms containing c to the left, all other terms to the right
-4c=-29.2
c=-29.2/-4
c=7+1/3.3333333333333
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