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c+31=2c+30
We move all terms to the left:
c+31-(2c+30)=0
We get rid of parentheses
c-2c-30+31=0
We add all the numbers together, and all the variables
-1c+1=0
We move all terms containing c to the left, all other terms to the right
-c=-1
c=-1/-1
c=1
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