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-31=2c-9
We move all terms to the left:
-31-(2c-9)=0
We get rid of parentheses
-2c+9-31=0
We add all the numbers together, and all the variables
-2c-22=0
We move all terms containing c to the left, all other terms to the right
-2c=22
c=22/-2
c=-11
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