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42=8c-5
We move all terms to the left:
42-(8c-5)=0
We get rid of parentheses
-8c+5+42=0
We add all the numbers together, and all the variables
-8c+47=0
We move all terms containing c to the left, all other terms to the right
-8c=-47
c=-47/-8
c=5+7/8
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