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27=5+13+c
We move all terms to the left:
27-(5+13+c)=0
We add all the numbers together, and all the variables
-(c+18)+27=0
We get rid of parentheses
-c-18+27=0
We add all the numbers together, and all the variables
-1c+9=0
We move all terms containing c to the left, all other terms to the right
-c=-9
c=-9/-1
c=+9
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