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84=16+4c
We move all terms to the left:
84-(16+4c)=0
We add all the numbers together, and all the variables
-(4c+16)+84=0
We get rid of parentheses
-4c-16+84=0
We add all the numbers together, and all the variables
-4c+68=0
We move all terms containing c to the left, all other terms to the right
-4c=-68
c=-68/-4
c=+17
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