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84=4+2c
We move all terms to the left:
84-(4+2c)=0
We add all the numbers together, and all the variables
-(2c+4)+84=0
We get rid of parentheses
-2c-4+84=0
We add all the numbers together, and all the variables
-2c+80=0
We move all terms containing c to the left, all other terms to the right
-2c=-80
c=-80/-2
c=+40
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