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19c-31=2c+20
We move all terms to the left:
19c-31-(2c+20)=0
We get rid of parentheses
19c-2c-20-31=0
We add all the numbers together, and all the variables
17c-51=0
We move all terms containing c to the left, all other terms to the right
17c=51
c=51/17
c=3
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