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c-28=2c-84
We move all terms to the left:
c-28-(2c-84)=0
We get rid of parentheses
c-2c+84-28=0
We add all the numbers together, and all the variables
-1c+56=0
We move all terms containing c to the left, all other terms to the right
-c=-56
c=-56/-1
c=+56
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