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28=8c-12
We move all terms to the left:
28-(8c-12)=0
We get rid of parentheses
-8c+12+28=0
We add all the numbers together, and all the variables
-8c+40=0
We move all terms containing c to the left, all other terms to the right
-8c=-40
c=-40/-8
c=+5
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