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3=c-12/2
We move all terms to the left:
3-(c-12/2)=0
We add all the numbers together, and all the variables
-(c-6)+3=0
We get rid of parentheses
-c+6+3=0
We add all the numbers together, and all the variables
-1c+9=0
We move all terms containing c to the left, all other terms to the right
-c=-9
c=-9/-1
c=+9
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