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12-4c=7+c+8
We move all terms to the left:
12-4c-(7+c+8)=0
We add all the numbers together, and all the variables
-4c-(c+15)+12=0
We get rid of parentheses
-4c-c-15+12=0
We add all the numbers together, and all the variables
-5c-3=0
We move all terms containing c to the left, all other terms to the right
-5c=3
c=3/-5
c=-3/5
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