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84=2c-26
We move all terms to the left:
84-(2c-26)=0
We get rid of parentheses
-2c+26+84=0
We add all the numbers together, and all the variables
-2c+110=0
We move all terms containing c to the left, all other terms to the right
-2c=-110
c=-110/-2
c=+55
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