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c-21=2c-71
We move all terms to the left:
c-21-(2c-71)=0
We get rid of parentheses
c-2c+71-21=0
We add all the numbers together, and all the variables
-1c+50=0
We move all terms containing c to the left, all other terms to the right
-c=-50
c=-50/-1
c=+50
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