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c-20=2c-48
We move all terms to the left:
c-20-(2c-48)=0
We get rid of parentheses
c-2c+48-20=0
We add all the numbers together, and all the variables
-1c+28=0
We move all terms containing c to the left, all other terms to the right
-c=-28
c=-28/-1
c=+28
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