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31=5c+8-3c+3
We move all terms to the left:
31-(5c+8-3c+3)=0
We add all the numbers together, and all the variables
-(2c+11)+31=0
We get rid of parentheses
-2c-11+31=0
We add all the numbers together, and all the variables
-2c+20=0
We move all terms containing c to the left, all other terms to the right
-2c=-20
c=-20/-2
c=+10
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