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12=c/3+8
We move all terms to the left:
12-(c/3+8)=0
We get rid of parentheses
-c/3-8+12=0
We multiply all the terms by the denominator
-c-8*3+12*3=0
We add all the numbers together, and all the variables
-1c+12=0
We move all terms containing c to the left, all other terms to the right
-c=-12
c=-12/-1
c=+12
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