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3c+28=8c-7
We move all terms to the left:
3c+28-(8c-7)=0
We get rid of parentheses
3c-8c+7+28=0
We add all the numbers together, and all the variables
-5c+35=0
We move all terms containing c to the left, all other terms to the right
-5c=-35
c=-35/-5
c=+7
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