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12=5c-12+3c
We move all terms to the left:
12-(5c-12+3c)=0
We add all the numbers together, and all the variables
-(8c-12)+12=0
We get rid of parentheses
-8c+12+12=0
We add all the numbers together, and all the variables
-8c+24=0
We move all terms containing c to the left, all other terms to the right
-8c=-24
c=-24/-8
c=+3
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