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39=8+12+c
We move all terms to the left:
39-(8+12+c)=0
We add all the numbers together, and all the variables
-(c+20)+39=0
We get rid of parentheses
-c-20+39=0
We add all the numbers together, and all the variables
-1c+19=0
We move all terms containing c to the left, all other terms to the right
-c=-19
c=-19/-1
c=+19
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