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8.3-3c=13.1
We move all terms to the left:
8.3-3c-(13.1)=0
We add all the numbers together, and all the variables
-3c-4.8=0
We move all terms containing c to the left, all other terms to the right
-3c=4.8
c=4.8/-3
c=-1+1/1.6666666666667
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